CA1062995A - Strip steel cutter to be used in wood chipping machines - Google Patents
Strip steel cutter to be used in wood chipping machinesInfo
- Publication number
- CA1062995A CA1062995A CA297,844A CA297844A CA1062995A CA 1062995 A CA1062995 A CA 1062995A CA 297844 A CA297844 A CA 297844A CA 1062995 A CA1062995 A CA 1062995A
- Authority
- CA
- Canada
- Prior art keywords
- strip steel
- cutter
- steel cutter
- beads
- recesses
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 239000002023 wood Substances 0.000 title claims abstract description 14
- 239000011324 bead Substances 0.000 claims abstract description 31
- 238000005520 cutting process Methods 0.000 claims abstract description 27
- 210000002268 wool Anatomy 0.000 claims abstract description 6
- 238000004049 embossing Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- FSVJFNAIGNNGKK-UHFFFAOYSA-N 2-[cyclohexyl(oxo)methyl]-3,6,7,11b-tetrahydro-1H-pyrazino[2,1-a]isoquinolin-4-one Chemical compound C1C(C2=CC=CC=C2CC2)N2C(=O)CN1C(=O)C1CCCCC1 FSVJFNAIGNNGKK-UHFFFAOYSA-N 0.000 description 1
- 241000370685 Arge Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/005—Tools therefor
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Shearing Machines (AREA)
- Scissors And Nippers (AREA)
- Debarking, Splitting, And Disintegration Of Timber (AREA)
- Knives (AREA)
- Manufacture Of Wood Veneers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A strip steel cutter to be used in wood chipping machines for peeling off wood chips or wood wool, has scratchers pro-jecting beyond its cutting edge and formed by curved up beads which extend transversely over the total width of the cutter and cross recesses provided parallelly to the central longitu-dinal axis of the cutter, whereby stop faces are formed.
A strip steel cutter to be used in wood chipping machines for peeling off wood chips or wood wool, has scratchers pro-jecting beyond its cutting edge and formed by curved up beads which extend transversely over the total width of the cutter and cross recesses provided parallelly to the central longitu-dinal axis of the cutter, whereby stop faces are formed.
Description
r~~
Z995 ; ~.
The invention relates to a strip steel cutter to be used in wood chipping machines for peeling off wood chips or wood wool t provided with scratchers projecting beyond the cutting edge of the cutter and formed there by curving up beads, as well as to a method of producing a strip steel cutter.
When producing chips for chip wood or the like, cutter block chippers are used, wherein single-edged or double-edged turnable cutters produced of strip steel and inserted in the cutter block have proved advantageous.
In order to delimit the dimensions of the chips it has been known to emboss, by means of embossing tools, scratchers into the cutting edges of the cutters in the regio~ of the cutting edges, i.e. beadlike curvatures projecting out of the , ~v cutting edge and interrupting the edge in the longitudinal direction (German Offenlegungsschrift No. 2,214,434~. The ;~
heights of these beadlike scratchers are technologically limited, because of the maximally admissible elongation of the region of the cutting edges. The scratchers could be produced ; - -~
so as to project beyond the cutting edge only by between ~o approximately 0.2 and 1.4 mm, which approximately corresponds to the chip width of a flake, the cutters thus being usable only for the production of flakes. If thicker chips or wood wool were to be produced, the maximally achievable height of the scratchers scored in the region of the cutting edges did not suffice for a perfect delimitation of the chips.
The scratchers produced in the region of the cutting edges by deformation furthermore have the disadvantage that the plane ;
of the cutting edge and the plane of the scratcher are not parallel, so that such scratchers - as compared to the cutting 3o edge - are subjected to greater wear and that these strip steel - 1 - :
,~
'. . . ': . ,, '' '':, , , ' ~6;Z995 cutters have to be exchanged even before the cutting edge be-comes blunt~
A problem with cutters produced of strip steel is the po-sitive mounting of the cutters in the cutter block. For solving this problem lt has been known, for instance from German Offen-legungsschrift No. 2,220,003, to provide strip steel cutters with holes in which holding pins of the cutter block engage.
This mode of fastening has the disadvantage that only line con-tact prevails between the holding pins and the holes of the cutters, and that the holes as well as the pins are worn out on account of the dynamic stress exerted by the cutting forces.
The cutter then will not any longer be positioned exactly on the prescribed path.
It has further been known (German Offenlegungsschrift No.
Z995 ; ~.
The invention relates to a strip steel cutter to be used in wood chipping machines for peeling off wood chips or wood wool t provided with scratchers projecting beyond the cutting edge of the cutter and formed there by curving up beads, as well as to a method of producing a strip steel cutter.
When producing chips for chip wood or the like, cutter block chippers are used, wherein single-edged or double-edged turnable cutters produced of strip steel and inserted in the cutter block have proved advantageous.
In order to delimit the dimensions of the chips it has been known to emboss, by means of embossing tools, scratchers into the cutting edges of the cutters in the regio~ of the cutting edges, i.e. beadlike curvatures projecting out of the , ~v cutting edge and interrupting the edge in the longitudinal direction (German Offenlegungsschrift No. 2,214,434~. The ;~
heights of these beadlike scratchers are technologically limited, because of the maximally admissible elongation of the region of the cutting edges. The scratchers could be produced ; - -~
so as to project beyond the cutting edge only by between ~o approximately 0.2 and 1.4 mm, which approximately corresponds to the chip width of a flake, the cutters thus being usable only for the production of flakes. If thicker chips or wood wool were to be produced, the maximally achievable height of the scratchers scored in the region of the cutting edges did not suffice for a perfect delimitation of the chips.
The scratchers produced in the region of the cutting edges by deformation furthermore have the disadvantage that the plane ;
of the cutting edge and the plane of the scratcher are not parallel, so that such scratchers - as compared to the cutting 3o edge - are subjected to greater wear and that these strip steel - 1 - :
,~
'. . . ': . ,, '' '':, , , ' ~6;Z995 cutters have to be exchanged even before the cutting edge be-comes blunt~
A problem with cutters produced of strip steel is the po-sitive mounting of the cutters in the cutter block. For solving this problem lt has been known, for instance from German Offen-legungsschrift No. 2,220,003, to provide strip steel cutters with holes in which holding pins of the cutter block engage.
This mode of fastening has the disadvantage that only line con-tact prevails between the holding pins and the holes of the cutters, and that the holes as well as the pins are worn out on account of the dynamic stress exerted by the cutting forces.
The cutter then will not any longer be positioned exactly on the prescribed path.
It has further been known (German Offenlegungsschrift No.
2,514,548) to provide the strip steel cutter with a groove in which a spring arranged on the cutter holder of the cutter block positively engages. By this, the cutter is supported along a ~arge area and the exact position of the cutter is guaranteed even after long times of operation. In this case, it is however disadvantageous that the thickness of the strip steel must not be under a certain value, since the inherent stiffness o the cutter would otherwise be endangered and the groove cross section serving for clamping the cutter would be too thin.
The invention aims at avoiding these disadvantages and difficulties and has as its object ~a provide a strip steel cutter of the initially described kind having scratchers-and being produceable of extremely thin strip steel, in which cutter the scratchers can be formed with any desired height and which, despite its low thickness, can be perfectly centered and fixed.
These objects are achieved according to the invention in , , , ~ ; :
106Z9~5 that the beads extend transversely over the total width of the strip steel cutter, crossing recesses, preferably long holes, each provided parallelly to the central longitudinal axis of the cutter, for the formation of stop faces.
The height of the scratcher can thus be chosen freely, it will result from the respective bead size provided which has no technological limits~ The beads interrupted by the recesses, on the cutting faces of the beads with the recesses form stop faces projecting out of the strip plane, for centering and fix-ing the strip steel cutter, so that the cutter, even if it isproduced of very thin strip material, can still be precisely centered and fixed.
If the strip steel cutter is to be used as a turnable cut-ter with cutting edges ground into both longitudinal edges, the recesses advantageously extend symmetrically to the central longitudinal axis of the cutter.
According to a preferred embodiment the faces directed to-wards each other, of each beadl contact each other.
The invention shall now be explalned in more detail by way of three embodiments illustrated in the drawing, wherein Fig. 1 shows a section of a strip steel cutter, viewed per-pendicularly to the strip steel plane before curving up the scratchers, -Fig. 2 is a side view of a strip steel cutter section with scratchers already formed therein, Fig. 3 is a view in the direction of the arrow III of Fig.2, Fig. 4 shows a further embodiment of the strip steel cutter ~-according to the invention, in an illustration analogous to Fig. 2,
The invention aims at avoiding these disadvantages and difficulties and has as its object ~a provide a strip steel cutter of the initially described kind having scratchers-and being produceable of extremely thin strip steel, in which cutter the scratchers can be formed with any desired height and which, despite its low thickness, can be perfectly centered and fixed.
These objects are achieved according to the invention in , , , ~ ; :
106Z9~5 that the beads extend transversely over the total width of the strip steel cutter, crossing recesses, preferably long holes, each provided parallelly to the central longitudinal axis of the cutter, for the formation of stop faces.
The height of the scratcher can thus be chosen freely, it will result from the respective bead size provided which has no technological limits~ The beads interrupted by the recesses, on the cutting faces of the beads with the recesses form stop faces projecting out of the strip plane, for centering and fix-ing the strip steel cutter, so that the cutter, even if it isproduced of very thin strip material, can still be precisely centered and fixed.
If the strip steel cutter is to be used as a turnable cut-ter with cutting edges ground into both longitudinal edges, the recesses advantageously extend symmetrically to the central longitudinal axis of the cutter.
According to a preferred embodiment the faces directed to-wards each other, of each beadl contact each other.
The invention shall now be explalned in more detail by way of three embodiments illustrated in the drawing, wherein Fig. 1 shows a section of a strip steel cutter, viewed per-pendicularly to the strip steel plane before curving up the scratchers, -Fig. 2 is a side view of a strip steel cutter section with scratchers already formed therein, Fig. 3 is a view in the direction of the arrow III of Fig.2, Fig. 4 shows a further embodiment of the strip steel cutter ~-according to the invention, in an illustration analogous to Fig. 2,
3~ Figs. 5 and 6 show a further embodiment, Fig. 5 illustrating -- 3 ~
, -. - :, ' ,' ~: ~ -~ , . " ' : . ; ,, .
1~6~95 a top view analogous to Fig. 1, and Fig. 6 illustrating a view in the direction of the arrow VI of Fig. 5.
A strip steel section is denoted by 1, in which long holes 2 are provided whose central longitudinal plane 3 is laid through the central longitudinal axis 4 and at a right angle to the plane of the strip steel. Cutting edges 5 are ground into both ;
longitudinal edges of the strip steel 1.
In Fig. 2 a side view of a strip steel cutter section is represented, already comprising embossed beads 6 forming the scratchers. The central plane 7 of each bead, in this embodi-ment, extends perpendîcularly to the central longitudinal axis 4 of the strip steel cutter. In Fig. 1 this central plane 7 is also indicated in a dot-and-dash line. As can be seen from Fig.3 the cutting edges 8 of the scratchers are ground into the corners of the beads.
As can be seen particularly from Fig. 3, the curved up beads 6 extending over the total width of the strip steel cutter 1 are interrupted by the long holes 2 towards the central longitudinal axis of the cutter, and are limited by the walls of the long holes, stop faces 9 thus being formed, which serve for clamping the strip steel cutter in the cutter holder.
As is shown in Flg. 2, the beads 6 are upset in the direc-tion of the central longitudinal axis 4 of the strip steel cutter until the opposing faces of each bead 6 contact each other, thus increasing the inherent stiffness of the cutter and the wear - resistance of the scratchers.
In Fig. 4 a strip steel cutter is illustrated in the side view, in which the central planes 7' of the beads 6' are arranged perpendicularly to the strip steel face, but in a slight angle inclinedly to the central longitudinal axis 4 of the strip steel
, -. - :, ' ,' ~: ~ -~ , . " ' : . ; ,, .
1~6~95 a top view analogous to Fig. 1, and Fig. 6 illustrating a view in the direction of the arrow VI of Fig. 5.
A strip steel section is denoted by 1, in which long holes 2 are provided whose central longitudinal plane 3 is laid through the central longitudinal axis 4 and at a right angle to the plane of the strip steel. Cutting edges 5 are ground into both ;
longitudinal edges of the strip steel 1.
In Fig. 2 a side view of a strip steel cutter section is represented, already comprising embossed beads 6 forming the scratchers. The central plane 7 of each bead, in this embodi-ment, extends perpendîcularly to the central longitudinal axis 4 of the strip steel cutter. In Fig. 1 this central plane 7 is also indicated in a dot-and-dash line. As can be seen from Fig.3 the cutting edges 8 of the scratchers are ground into the corners of the beads.
As can be seen particularly from Fig. 3, the curved up beads 6 extending over the total width of the strip steel cutter 1 are interrupted by the long holes 2 towards the central longitudinal axis of the cutter, and are limited by the walls of the long holes, stop faces 9 thus being formed, which serve for clamping the strip steel cutter in the cutter holder.
As is shown in Flg. 2, the beads 6 are upset in the direc-tion of the central longitudinal axis 4 of the strip steel cutter until the opposing faces of each bead 6 contact each other, thus increasing the inherent stiffness of the cutter and the wear - resistance of the scratchers.
In Fig. 4 a strip steel cutter is illustrated in the side view, in which the central planes 7' of the beads 6' are arranged perpendicularly to the strip steel face, but in a slight angle inclinedly to the central longitudinal axis 4 of the strip steel
4 --~06~995 cutter, in order to take into account the oblique cutting angle of the cutter.
In the embodiment illustrated in Figs. 5 and 6, beads 6' are provided similarly to the embodiment illustrated in Fig. 4, which beads are arranged in a slight angle to the central longi-tudinal axis 4 of the strip steel cutter. In addition to the stop faces 9 formed by the beads further stop faces 10 are pro-vided which are formed by punching a further recess 11 between two adjacent beads 6' and bending up the edges 12 of that re-cess 11. Those additional stop faces lO can be designed in away that the strip steel cutter can be fastened to the cutter holder of the cutter block with a clamping effect, similar to the snap-fastener principle.
The strip steel cutter according to the invention can, since the beads 6, 6' fulfill two functions, i.e.
l) the formation of the scratchers and 2) the formation of the stop faces, -be produced of strip steel with a thickness of less than 1.5, ~ in particular less than lmm, and nevertheless can, according to the height of the embossed bead, be used also for peeling off thick chips and wood wool, the cutter being precisely adjustable and fixable in the cutter block, due to the stop faces 9 formed by the beads 6, 6', which stop faces are relatively large with regard to the thickness of the cutter, and the service life of the scratchers being approximately the same as of the cutting edge, since crowding in the region of the scratchers is tota~ly avoided. A further advantage of the strip steel cutter according to the invention is to be seen in the simple and cost-saving production of the cutter.
For producing the strip steel cutter according to the in-f -la62sss vention the long holes 2 are punched into the initially con-tinuous strip steel. Afterwards, the beads 6, 6', whose central planes 7, 7' cross the long holes 2 and extend over the total width of the strip steel, are embossed and, if desired, upset, so that two opposing faces of each bead will get into contact with each other. ~fterwards, the strip steel is sub~ected to a grinding and quenching and tempering treatment for producing the cutting edges 8 of the scratcher in the region of the outer edges of the beads 6, 6'. Then the strip steel is cut into in-dividual cutters. During the grinding and quenching and temperingtreatment the stop faces 9 of the beads,-pro~ecting out of the strip steel plane, serve for the exact guidance of the strip steel.
~,
In the embodiment illustrated in Figs. 5 and 6, beads 6' are provided similarly to the embodiment illustrated in Fig. 4, which beads are arranged in a slight angle to the central longi-tudinal axis 4 of the strip steel cutter. In addition to the stop faces 9 formed by the beads further stop faces 10 are pro-vided which are formed by punching a further recess 11 between two adjacent beads 6' and bending up the edges 12 of that re-cess 11. Those additional stop faces lO can be designed in away that the strip steel cutter can be fastened to the cutter holder of the cutter block with a clamping effect, similar to the snap-fastener principle.
The strip steel cutter according to the invention can, since the beads 6, 6' fulfill two functions, i.e.
l) the formation of the scratchers and 2) the formation of the stop faces, -be produced of strip steel with a thickness of less than 1.5, ~ in particular less than lmm, and nevertheless can, according to the height of the embossed bead, be used also for peeling off thick chips and wood wool, the cutter being precisely adjustable and fixable in the cutter block, due to the stop faces 9 formed by the beads 6, 6', which stop faces are relatively large with regard to the thickness of the cutter, and the service life of the scratchers being approximately the same as of the cutting edge, since crowding in the region of the scratchers is tota~ly avoided. A further advantage of the strip steel cutter according to the invention is to be seen in the simple and cost-saving production of the cutter.
For producing the strip steel cutter according to the in-f -la62sss vention the long holes 2 are punched into the initially con-tinuous strip steel. Afterwards, the beads 6, 6', whose central planes 7, 7' cross the long holes 2 and extend over the total width of the strip steel, are embossed and, if desired, upset, so that two opposing faces of each bead will get into contact with each other. ~fterwards, the strip steel is sub~ected to a grinding and quenching and tempering treatment for producing the cutting edges 8 of the scratcher in the region of the outer edges of the beads 6, 6'. Then the strip steel is cut into in-dividual cutters. During the grinding and quenching and temperingtreatment the stop faces 9 of the beads,-pro~ecting out of the strip steel plane, serve for the exact guidance of the strip steel.
~,
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a strip steel cutter to be used in a wood chipping ma-chine for peeling off chips or wood wool, said strip steel cutter having at least one cutting edge and beads curved up in said strip steel cutter for forming scratchers on said at least one cutting edge, said scratchers thus projecting beyond said at least one cutting edge, the improvement com-prising - said beads extending transversely over the total width of said strip steel cutter, - recesses being provided parallelly to the central longi-tudinal axis of said strip steel cutter, and - said beads crossing said recesses so as to form stop faces.
2. A strip steel cutter as set forth in claim 1, wherein said recesses are long holes.
3. A strip steel cutter as set forth in claim 1, wherein said strip steel cutter has two longitudinal edges ground to form cutting edges, and said recesses extend symmetrically to said central longitudinal axis of said strip steel cutter.
4. A strip steel cutter as set forth in claim 1, wherein each of said beads has opposing faces, said opposing faces being in contact with each other.
5. A method of producing a strip steel cutter having at least one cutting edge, to be used in a wood chipping machine for peeling off chips or wood wool, by punching, embossing, grinding and hardening, comprising the steps of - providing a strip steel, - punching recesses into said strip steel, - subsequently embossing beads in the region of said recesses so as to cross said recesses, said beads extending trans-versely over the total width of said strip steel cutter, forming scratchers on said at least one cutting edge, which scratchers thus project beyond said at least one cutting edge, stop faces formed where said beads cross said re-cesses, directed towards each other and towards said cen-tral longitudinal axis, acting as a guide, and - said strip steel being guided along said guide during fur-ther treatment of said strip steel cutter.
6. A method as set forth in claim 5, wherein said recesses are long holes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2708739A DE2708739C3 (en) | 1977-03-01 | 1977-03-01 | Steel strip knives for wood cutting machines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062995A true CA1062995A (en) | 1979-09-25 |
Family
ID=6002425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA297,844A Expired CA1062995A (en) | 1977-03-01 | 1978-02-28 | Strip steel cutter to be used in wood chipping machines |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT358806B (en) |
| CA (1) | CA1062995A (en) |
| DE (1) | DE2708739C3 (en) |
| FI (1) | FI780495A7 (en) |
| FR (1) | FR2382322A1 (en) |
| IT (1) | IT7820702A0 (en) |
| NL (1) | NL7801846A (en) |
| SE (1) | SE7801629L (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2818143C2 (en) * | 1978-04-26 | 1981-03-26 | Inter-Wood-Maschinen Gmbh & Co Kg, 86983 Lechbruck | Regrindable knife for wood cutting machines |
| DE2929020C2 (en) * | 1979-07-18 | 1981-08-27 | Elsen, Reinhold W., Dr.-Ing., 5000 Köln | Disposable reversible knives for wood chipping machines |
| DE2952710C2 (en) * | 1979-12-29 | 1984-04-12 | Wilhelm 6660 Zweibrücken Pallmann | Regrindable knife for wood cutting machines |
| DE3209246C2 (en) * | 1982-03-13 | 1984-12-20 | Barke GmbH, 6384 Oberreifenberg | Knife carrier of a planer knife |
| DE3531996A1 (en) * | 1985-09-07 | 1987-03-19 | Licentia Gmbh | Cutting-blade set for electrically driven portable planers |
| DE4013050A1 (en) * | 1990-04-24 | 1991-10-31 | Kurt Bruecher | Cutter-head for hand-held planers - has profiled blades keyed into counter-profiled matching groove-like depression in surface of slots |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB937955A (en) * | 1961-08-30 | 1963-09-25 | Firth Cleveland Tools Ltd | Improvements relating to rotary grooving tools |
| DE6608303U (en) * | 1966-10-10 | 1971-07-29 | Hombak Maschinenfabrik Kg | CUTTING STRIP KNIFE FOR WOOD CHAMPING MACHINES |
| CH598925A5 (en) * | 1974-10-17 | 1978-05-12 | Ledermann & Co |
-
1977
- 1977-03-01 DE DE2708739A patent/DE2708739C3/en not_active Expired
-
1978
- 1978-02-13 SE SE7801629A patent/SE7801629L/en unknown
- 1978-02-15 FI FI780495A patent/FI780495A7/en not_active Application Discontinuation
- 1978-02-15 AT AT108078A patent/AT358806B/en not_active IP Right Cessation
- 1978-02-17 NL NL7801846A patent/NL7801846A/en not_active Application Discontinuation
- 1978-02-28 CA CA297,844A patent/CA1062995A/en not_active Expired
- 1978-02-28 IT IT7820702A patent/IT7820702A0/en unknown
- 1978-03-01 FR FR7805919A patent/FR2382322A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| FR2382322A1 (en) | 1978-09-29 |
| DE2708739A1 (en) | 1978-09-14 |
| IT7820702A0 (en) | 1978-02-28 |
| NL7801846A (en) | 1978-09-05 |
| SE7801629L (en) | 1978-09-02 |
| FI780495A7 (en) | 1978-09-02 |
| ATA108078A (en) | 1980-02-15 |
| DE2708739B2 (en) | 1979-11-22 |
| DE2708739C3 (en) | 1980-07-31 |
| AT358806B (en) | 1980-10-10 |
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