US2456474A - Electric discharge device - Google Patents

Electric discharge device Download PDF

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Publication number
US2456474A
US2456474A US680895A US68089546A US2456474A US 2456474 A US2456474 A US 2456474A US 680895 A US680895 A US 680895A US 68089546 A US68089546 A US 68089546A US 2456474 A US2456474 A US 2456474A
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US
United States
Prior art keywords
envelope
electrons
discharge device
supported
electric discharge
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 - Lifetime
Application number
US680895A
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English (en)
Inventor
Joseph A Wainwright
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US680895A priority Critical patent/US2456474A/en
Priority to FR946839D priority patent/FR946839A/fr
Priority to GB17197/47A priority patent/GB668161A/en
Application granted granted Critical
Publication of US2456474A publication Critical patent/US2456474A/en
Priority to US174769A priority patent/US2592242A/en
Priority to FR61828D priority patent/FR61828E/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/84—Arrangements for removing or diverting unwanted particles, e.g. for negative ions or fringing electrons; Arrangements for velocity or mass selection
    • H01J29/845—Arrangements for removing or diverting unwanted particles, e.g. for negative ions or fringing electrons; Arrangements for velocity or mass selection by means of magnetic systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/84—Arrangements for removing or diverting unwanted particles, e.g. for negative ions or fringing electrons; Arrangements for velocity or mass selection

Definitions

  • FIG. 1 is an elevational view, partly in section, of a cathode ray tube embodying my invention
  • Fig. 2 is an enlarged sectional view of a portion of the device illustrated in Fig. 1 and showing in detail the electron gun structure
  • Fig. 3 is a sectional view taken along the line 3-3 of Fig. 2.
  • a cathode ray tube which may be of the type employed in television receivers, and which includes an envelope I formed of glass.
  • the envelope may be of the usual shape including an elongated neck portion and an enlarged or bulbous portion closed at its outer end to provide a viewing window of the tube.
  • the inner surface of the window is provided with a uorescent coating 2 which may be applied in accordance with techniques well understood in for devices oi! ⁇ the art and which may to advantage include what are commonly known as medium persistent phosphors.
  • the gun structure is adjacent the neck portion of the envelope and is supported from the end wall by a plurality of conductors 3 which are sealed through the envelope wall.
  • the cathode is supported within the grid cylinder 6 on an insulating disk 1 and is positioned and retained by suitable spacing and retaining washers 8, 9 and IIB.
  • the grid 5 is supported on a. flanged collar II which is in turn secured to the supporting conductors 3.
  • a plurality of glass supports or stalks I 2 are secured to the grid cylinder 5 by laterally projecting metal lugs I3.
  • a second or accelerating grid cylinder It and an anode cylinder I5 are supported in axial alinement with the grid cylinder 5 and in spaced and insulated relation with respect thereto by a plurality of lugs I6 which are sealed into the supporting stalks I2.
  • the outer end of the anode cylinder I5 is closed by a disklike member I1, the outer edge of which is spaced slightly from the wall of the envelope and which is provided ywith a centrally located limiting aperture I8 which confines the electron beam projected from the gun.
  • the outer edge of the gun is physically positioned in the central portion of the neck by a plurality of spring ngers I9 which extend along the envelope Wall and contact the interior conducting coating 2t which is applied to the inner wall of the envelope from the central portion of the neck to within approximately one inch of the fluorescent screen 2.
  • the conducting coating may be formed of a graphite solution in accordance with well known practices, and serves as a return conducting path for electrons liberated from the iluorescent screen 2.
  • the outer end of the grid cylinder It and the inner end of the anode cylinder I5 are positioned in mutually spaced and insulated relation and shaped to define a gap extending at an acute angle with respect to the longitudinal axis of the gun. Since the anode cylinder I5 operates at a high positive potential with respect to the grid cylinder It, it will be apparent that'the electric field existing across ⁇ the gap will deflect the electrons of the beam to the left, as viewed in Fig. 2.
  • the base is secured to the end of the neck portion oi' the envelope by a. body of cement 23.
  • An anode or high voltage terminal 24 is provided on the side wall of the bulbous portion of the envelope I and a conductor 25 sealed through the envelope wall connects the terminal with the internal conducting coating 20.
  • An exterior coating 26 of conducting material may be applied to the outside of the envelope and in cooperation with the internal coating 20 provides a capacitive anode connection.
  • I provide an improved structure for providing a pair of transverse magnetic iields on opposite sides of the gap between cylinders Il and I deflection provided by the electrostatic field across the gap between grid Il and anode I5 eil'ect the selective deflection of the electrons and ions of the electron beam.
  • a pair of permanently magnetized spring rings 21 and 28 are positioned on the neck of the envelope on opposite sides of the gap between the accelerating grid cylinder I4 and the anode cylinder I5.
  • These rings may to advantage be formed of one 'of the copper-nickle-iron alloys which'provides a magnet of light weight and high coercive force.
  • the rings are resilient and are easily mounted on the neck of the tube.
  • the rings 21 and 28 are split and mounted on a resilient support which in the illustrated embodiment takes the form of a rubber tube 29 surrounding the neck of the envelope. With this construction, it is possible to adjust the angular positions of the rings to provide the desired control of the beam.
  • the rings 21 and 28 are magnetized in such a manner that a north pole exists at a restricted circumferential portion of the ring provided at a diametrically opposite region.
  • the rings 21 and 28 are further positioned or displaced rotationally 180; that is, the north pole of one magnet occupies the same radial plane as the south pole of the other magnet.
  • each pole guiar member having one arm 30 extending longitudinally of the gun structure and the other arm secured to the outer wall of the accelerating grid by a suitable tab 3i which is welded to the pole piece and to the grid cylinder. Since rotation of the ring 21 displaces the poles thereof with respect to the pole pieces' it changes the strength of the eld acting on the electron beam. By independent rotation of rings 21 and 28 the desired trapping of the ions is effected and the beam of electrons is directed to the desired spot on the screen.
  • the accelerating grid cylinder I 4 is operated at a positive potential with respect to the grid cylinder 5 and the anode cylinder i5 has a positive and which in speciction with the and a south pole is positioned on the neck ection of the 4 potential with respect to the grid cylinder Il.
  • Electrons emitted from the active surface of the cathode 4 pass through the aperture 6 of the control grid and through the aperture of the accelerating grid into the region beneath the pole pieces 30.
  • the permanent magnet ring 21 is of the envelope with the north pole opposite the pole pieceshown in Fig. 2; that is, the pole piece at the back of the electron gun.
  • the magnetic field lines oi.' force project from the plane of the paper in a direction perpendicular to the axis of the electron gun. With the magnetic field in this direction, the electrons' and ions of the beam are deflected to the right, as viewed in Fig 2.
  • the deilection oi.' the charged particles in the magnetic eld is dependent upon the charge-to-mass ratios of these particles so that the ions of the beam are deflected substantially less than the electrons of Fig. 2.
  • the deheavy ions at this point is substantially the same as the deection of the electrons, but since the ions were substantially undefiected by the magnetic ileld, ⁇ they are now directed to the left of the axis of the electron gun and are collected on the wall of the anode cylinder I 5, The electrons are deected to the left the center of the anode cylinder and pass through the limiting aperture I8 at the outer end of the anode cylinder.
  • the second permanent magnet ring 28 is mounted with the north pole on the top of the envelope, as viewed in Figs. 1 and 2, and is eective to deilect the electrons to the n right.
  • the use of the second magnet ring which is preferably much weaker than the magnet ring 21 provides an adiustment for bringing the electron beam exactly into the center of the anode cylinder I5. It is apparent the angular position of the ring 28 independently of the ring 21 that the iinal position of the electron beam may be controlled. It'is also apparent that certain structural features of the magnet structure may be employed for purposes other than as components of an ion trap.
  • I of the beam type including an envelope, a source of electrons including an electron gun positioned at one end of said envelope, means including said gun for producing a beam of electrons and sub- Jecting said beam to an electrostatic field having a component transverse to the axis of said beam, and means for subjecting said beam to a transverse magnetic field to deflect the electrons of i said beam in a direction opposite to the deection produced by said electrostatic field, said last mentioned means including a substantially comthat by adjusting plete ring of permanently magnetized to produce a ux in the direction of a diameter of said ring resiliently supported on the exterior of said envelope.
  • an electric discharge device of the beam type including an envelope, a source of electrons including an electron gun positioned at one end of said envelope, means including said gun for producing a beam of electrons, and means for subjecting said beam to a transverse magnetic field to deflect the electrons of said beam in a direction transverse to the axis of said beam, said last mentioned means including a substantially complete ring of permanently magnetized and mechanically resilient ⁇ material supported on the exterior of said envelope.
  • an electric discharge device including an envelope having an elongated neck portion, an electron gun structure supported within said envelope for producing an electron beam, and means for controlling the transverse .position of said beam including a permanently magnetized substantially complete spring ring supported on the exterior of said neck portion and rotatably and axially adjustable to control the magnitude and direction of the deflection oi said beam produced by said means.
  • an electric discharge device including an envelope having an elongated neck portion, and electron gun structure supported within said envelope for producing an electron beam, a layer of resilient material surrounding said neck portion, and means for controlling the transverse position of said beam including a permanently magnetized substantially complete spring ring supported on said material and adjustable in position relative to said material to control the magnitudeand direction of the deflection of said beam produced by said means.
  • an electric discharge device of the beam type including an envelope having a neck portion, an electron gun supported in said neck portion and includingadjacent conducting members supported in spaced insulated relation and adapted when energized by potentials of different magnitudes to subject the electrons of said beam to a transverse electric field. and permanently magnetized ringlike members supported on the neck portion of said envelope in axially spaced relation on opposite 'sides of the space between said conducting members.
  • an electric discharge device of the beam type including an envelope having a neck portion, an electron gun supported in said magnetized material neck portion and including adjacent conducting members supported in spaced insulated relation and adapted when energized by potentials of diierent magnitudes to subject the electrons of the beam to a transverse electric iield, a pair of ring-like members of permanently magnetized material supported in axially spaced relation on the neck portion of said discharge device, said rings extending substantially completely around said neck portion and being magnetized to produce a flux along a diameter of the rings, and means for supporting said rings permitting rotational adjustment of one of said rings relative to the other, the resultant action of said rings and the electric field produced by said members cooperating to separate the ions and electrons of the beam.
  • An electric discharge device of the beam type including an envelope having aneck portion, an electron gun supported in the neck por tion of said envelope providing an electron beam, said gun structure including generally cylindrical grid and anode electrodes supported in mutually spaced end-to-end relation, the adjacent ends of said electrodes defining a gap therebetween extending at an acute angle with respect to the axis of said beam, a pair of ring-like permanent magnets supported on said neck portion at points spaced along said beam and on opposite sides ofsaid gap, said magnets being similarly magnetized and rotationally displaced degrees to provide transverse magnetic fields ofl opposite polarity on opposite sides of said gap and cooperating with the electric field produced' across said gap to selectively deiiect the electrons and ions of said beam and to cause the collection of the ions on said anode electrode.

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US680895A 1946-07-02 1946-07-02 Electric discharge device Expired - Lifetime US2456474A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US680895A US2456474A (en) 1946-07-02 1946-07-02 Electric discharge device
FR946839D FR946839A (fr) 1946-07-02 1947-05-16 Perfectionnements aux tubes à faisceau électronique
GB17197/47A GB668161A (en) 1946-07-02 1947-06-30 Improvements in cathode ray tubes
US174769A US2592242A (en) 1946-07-02 1950-07-19 Electron gun and mounting therefor
FR61828D FR61828E (fr) 1946-07-02 1951-07-05 Perfectionnements aux tubes à faisceau électronique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US680895A US2456474A (en) 1946-07-02 1946-07-02 Electric discharge device

Publications (1)

Publication Number Publication Date
US2456474A true US2456474A (en) 1948-12-14

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US680895A Expired - Lifetime US2456474A (en) 1946-07-02 1946-07-02 Electric discharge device

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Country Link
US (1) US2456474A (fr)
FR (2) FR946839A (fr)
GB (1) GB668161A (fr)

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513929A (en) * 1948-05-21 1950-07-04 Gen Electric Beam centering device for cathode-ray tubes
US2522872A (en) * 1949-01-10 1950-09-19 Heppner Mfg Company Device for controlling the path of travel of electrons in cathoderay tubes
US2525919A (en) * 1948-07-01 1950-10-17 Hazeltine Research Inc Centering arrangement for cathode-ray tubes
US2544898A (en) * 1949-12-31 1951-03-13 Guardian Electric Mfg Co Centering device for beams of cathode-ray tubes
US2544875A (en) * 1950-03-02 1951-03-13 Pye Ltd Combination centering, focusing, and deflecting device for beam of cathode-ray tubes
US2549602A (en) * 1949-10-01 1951-04-17 Indiana Steel Products Co Applicator for ion traps
US2552341A (en) * 1949-02-03 1951-05-08 Clarostat Mfg Co Inc Magnetic structure for use in ion-traps
US2552342A (en) * 1949-11-17 1951-05-08 Clarostat Mfg Co Inc Magnetic structure for use in ion-traps
US2553039A (en) * 1949-04-26 1951-05-15 Zenith Radio Corp Cathode-ray tube combined beam centering and deflection device
US2553792A (en) * 1949-10-01 1951-05-22 Indiana Steel Products Co Ion trap and centering magnet assembly
US2564737A (en) * 1949-12-23 1951-08-21 Rauland Corp Cathode-ray tube
US2565533A (en) * 1950-05-19 1951-08-28 Rauland Corp Cathode-ray tube
US2569327A (en) * 1948-08-31 1951-09-25 Rca Corp Electron beam bender
US2569517A (en) * 1949-09-09 1951-10-02 Du Mont Allen B Lab Inc Magnet for cathode-ray tube ion traps
US2574039A (en) * 1951-02-17 1951-11-06 All Star Products Inc Magnetic centering device for cathode ray tubes
US2575067A (en) * 1948-05-13 1951-11-13 Clarostat Mfg Co Inc Ion trap
US2580355A (en) * 1949-10-08 1951-12-25 Du Mont Allen B Lab Inc Ion trap magnet
US2582402A (en) * 1950-09-29 1952-01-15 Rauland Corp Ion trap type electron gun
US2592242A (en) * 1946-07-02 1952-04-08 Gen Electric Electron gun and mounting therefor
US2596508A (en) * 1950-04-19 1952-05-13 Rauland Corp Electron gun for cathode-ray tubes
US2597465A (en) * 1951-03-23 1952-05-20 Emmer Milton Beam deflector for cathode-ray tubes
US2597298A (en) * 1949-02-18 1952-05-20 Pye Ltd Beam centering device for cathoderay tubes
US2608666A (en) * 1948-12-21 1952-08-26 Hartford Nat Bank & Trust Co Braun tube for use in television
US2617060A (en) * 1950-05-02 1952-11-04 Hartford Nat Bank & Trust Co Cathode-ray tube
US2637828A (en) * 1949-11-25 1953-05-05 Du Mont Allen B Lab Inc Ion-trap cathode-ray tube
US2646522A (en) * 1948-06-29 1953-07-21 Rca Corp Cathode-ray centering
US2707246A (en) * 1952-09-04 1955-04-26 Gen Electric Combination focusing-ion trap structures for cathode-ray tubes
US2712079A (en) * 1946-12-13 1955-06-28 Lloyd P Hunter Calutron
US2732512A (en) * 1956-01-24 briggs
US2741724A (en) * 1951-11-27 1956-04-10 Rauland Corp Image-reproducing device
US2744208A (en) * 1949-12-02 1956-05-01 Rca Corp Ion trap electron gun
US2793312A (en) * 1952-12-24 1957-05-21 Rca Corp Electron gun structure
US2810851A (en) * 1955-07-01 1957-10-22 Johnson And Hoffman Mfg Corp Electrodes for electron gun units
US2842702A (en) * 1954-09-02 1958-07-08 Rca Corp Cathode grid assembly
US2915662A (en) * 1956-08-24 1959-12-01 Nat Video Corp Centering arrangement and method for beams of cathode ray tubes
US2963608A (en) * 1957-08-07 1960-12-06 Sylvania Electric Prod Cathode ray tube structure
US2964880A (en) * 1956-05-25 1960-12-20 Fivre Valvole Radio Elett Spa Process for preparing glass elements
US3011046A (en) * 1956-05-03 1961-11-28 Emporium Specialties Co Inc Manufacture of electrodes
DE1199893B (de) * 1960-04-18 1965-09-02 Owens Illinois Inc Glaskolben fuer eine Kathodenstrahlroehre
US3226587A (en) * 1960-01-28 1965-12-28 Rca Corp Cathode ray tube and magnetic deflection means therefor
US3814973A (en) * 1972-09-05 1974-06-04 Duro Test Corp Electric lamps of the vibrating filament type having a conductive coating

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB464637A (en) * 1934-10-19 1937-04-21 Fernseh Ag Improvements in or relating to magnetic deflecting means for cathode-ray tubes
GB498491A (en) * 1937-07-09 1939-01-09 A C Cossor Holdings Ltd Improvements in cathode ray tubes
US2188579A (en) * 1933-05-27 1940-01-30 Loewe Radio Inc Cathode ray tube, more particularly for television purposes
GB518221A (en) * 1938-08-12 1940-02-21 Ferranti Ltd Improvements in or relating to cathode ray tubes
US2211613A (en) * 1936-08-14 1940-08-13 Hygrade Sylvania Corp Cathode ray tube
US2274586A (en) * 1939-02-25 1942-02-24 Philco Radio & Television Corp Cathode ray tube

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2188579A (en) * 1933-05-27 1940-01-30 Loewe Radio Inc Cathode ray tube, more particularly for television purposes
GB464637A (en) * 1934-10-19 1937-04-21 Fernseh Ag Improvements in or relating to magnetic deflecting means for cathode-ray tubes
US2211613A (en) * 1936-08-14 1940-08-13 Hygrade Sylvania Corp Cathode ray tube
GB498491A (en) * 1937-07-09 1939-01-09 A C Cossor Holdings Ltd Improvements in cathode ray tubes
GB518221A (en) * 1938-08-12 1940-02-21 Ferranti Ltd Improvements in or relating to cathode ray tubes
US2274586A (en) * 1939-02-25 1942-02-24 Philco Radio & Television Corp Cathode ray tube

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732512A (en) * 1956-01-24 briggs
US2592242A (en) * 1946-07-02 1952-04-08 Gen Electric Electron gun and mounting therefor
US2712079A (en) * 1946-12-13 1955-06-28 Lloyd P Hunter Calutron
US2575067A (en) * 1948-05-13 1951-11-13 Clarostat Mfg Co Inc Ion trap
US2513929A (en) * 1948-05-21 1950-07-04 Gen Electric Beam centering device for cathode-ray tubes
US2646522A (en) * 1948-06-29 1953-07-21 Rca Corp Cathode-ray centering
US2525919A (en) * 1948-07-01 1950-10-17 Hazeltine Research Inc Centering arrangement for cathode-ray tubes
US2569327A (en) * 1948-08-31 1951-09-25 Rca Corp Electron beam bender
US2608666A (en) * 1948-12-21 1952-08-26 Hartford Nat Bank & Trust Co Braun tube for use in television
US2522872A (en) * 1949-01-10 1950-09-19 Heppner Mfg Company Device for controlling the path of travel of electrons in cathoderay tubes
US2552341A (en) * 1949-02-03 1951-05-08 Clarostat Mfg Co Inc Magnetic structure for use in ion-traps
DE973714C (de) * 1949-02-18 1960-05-19 Pye Ltd Einrichtung zum Zentrieren des Elektronenstrahles einer Kathodenstrahlroehre
US2597298A (en) * 1949-02-18 1952-05-20 Pye Ltd Beam centering device for cathoderay tubes
US2553039A (en) * 1949-04-26 1951-05-15 Zenith Radio Corp Cathode-ray tube combined beam centering and deflection device
US2569517A (en) * 1949-09-09 1951-10-02 Du Mont Allen B Lab Inc Magnet for cathode-ray tube ion traps
US2549602A (en) * 1949-10-01 1951-04-17 Indiana Steel Products Co Applicator for ion traps
US2553792A (en) * 1949-10-01 1951-05-22 Indiana Steel Products Co Ion trap and centering magnet assembly
US2580355A (en) * 1949-10-08 1951-12-25 Du Mont Allen B Lab Inc Ion trap magnet
US2552342A (en) * 1949-11-17 1951-05-08 Clarostat Mfg Co Inc Magnetic structure for use in ion-traps
US2637828A (en) * 1949-11-25 1953-05-05 Du Mont Allen B Lab Inc Ion-trap cathode-ray tube
US2744208A (en) * 1949-12-02 1956-05-01 Rca Corp Ion trap electron gun
US2564737A (en) * 1949-12-23 1951-08-21 Rauland Corp Cathode-ray tube
US2544898A (en) * 1949-12-31 1951-03-13 Guardian Electric Mfg Co Centering device for beams of cathode-ray tubes
US2544875A (en) * 1950-03-02 1951-03-13 Pye Ltd Combination centering, focusing, and deflecting device for beam of cathode-ray tubes
US2596508A (en) * 1950-04-19 1952-05-13 Rauland Corp Electron gun for cathode-ray tubes
US2617060A (en) * 1950-05-02 1952-11-04 Hartford Nat Bank & Trust Co Cathode-ray tube
US2565533A (en) * 1950-05-19 1951-08-28 Rauland Corp Cathode-ray tube
US2582402A (en) * 1950-09-29 1952-01-15 Rauland Corp Ion trap type electron gun
US2574039A (en) * 1951-02-17 1951-11-06 All Star Products Inc Magnetic centering device for cathode ray tubes
US2597465A (en) * 1951-03-23 1952-05-20 Emmer Milton Beam deflector for cathode-ray tubes
US2741724A (en) * 1951-11-27 1956-04-10 Rauland Corp Image-reproducing device
US2707246A (en) * 1952-09-04 1955-04-26 Gen Electric Combination focusing-ion trap structures for cathode-ray tubes
US2793312A (en) * 1952-12-24 1957-05-21 Rca Corp Electron gun structure
US2842702A (en) * 1954-09-02 1958-07-08 Rca Corp Cathode grid assembly
US2810851A (en) * 1955-07-01 1957-10-22 Johnson And Hoffman Mfg Corp Electrodes for electron gun units
US3011046A (en) * 1956-05-03 1961-11-28 Emporium Specialties Co Inc Manufacture of electrodes
US2964880A (en) * 1956-05-25 1960-12-20 Fivre Valvole Radio Elett Spa Process for preparing glass elements
US2915662A (en) * 1956-08-24 1959-12-01 Nat Video Corp Centering arrangement and method for beams of cathode ray tubes
US2963608A (en) * 1957-08-07 1960-12-06 Sylvania Electric Prod Cathode ray tube structure
US3226587A (en) * 1960-01-28 1965-12-28 Rca Corp Cathode ray tube and magnetic deflection means therefor
DE1199893B (de) * 1960-04-18 1965-09-02 Owens Illinois Inc Glaskolben fuer eine Kathodenstrahlroehre
US3814973A (en) * 1972-09-05 1974-06-04 Duro Test Corp Electric lamps of the vibrating filament type having a conductive coating

Also Published As

Publication number Publication date
FR946839A (fr) 1949-06-15
GB668161A (en) 1952-03-12
FR61828E (fr) 1955-05-18

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