FR707441A
(en )
1931-07-08
Production of new chromiferous coloring materials
GR2152B
(en )
1929-02-09
METHOD OF PRODUCTION OF MATERIAL COMPOSITION (ASPHALT ARTIST).
SU17694A1
(en )
1930-09-30
Method of making cushioning material
GR3124B
(en )
1931-03-10
METHOD OF PRODUCTION OF COATING NEW ASPHALT MIXTURES.
CH154163A
(en )
1932-04-30
Process for the production of hydrogen sulfide.
FR704129A
(en )
1931-05-13
Production of new coloring materials
CA296045A
(en )
1929-12-24
Method of making asphalt
CA288330A
(en )
1929-03-26
Material moving method
DK42950C
(en )
1930-09-15
Procedure for the production of bituminous paper.
FI12388A
(en )
1929-03-01
For the production of bituminous concrete
GR2356B
(en )
1929-07-05
ROAD COATING METHOD.
ES111959A3
(en )
1929-06-01
Manufacturing process of an insulating material.
SU19118A1
(en )
1931-01-31
Brick Making Machine
DK41963C
(en )
1930-03-31
Procedure for the Manufacture of Pavement Material.
ES114624A1
(en )
1929-10-01
Process for the manufacture of an improved tar.
GR904B
(en )
1925-05-13
NEW METHOD OF PRODUCTION OF HIGH ENDURANCE CEMENT.
FR691971A
(en )
1930-10-29
Production of new coloring materials
FR37190E
(en )
1930-10-25
Production of new coloring materials
DK44733C
(en )
1931-10-19
Method of Making Feed Cakes.
FR691973A
(en )
1930-10-29
Production of new metallic coloring materials
FR695869A
(en )
1930-12-23
Production of new metallic coloring materials
FR697600A
(en )
1931-01-20
Production of new metallic coloring materials
FR725326A
(en )
1932-05-11
Production of new coloring materials
FR723699A
(en )
1932-04-13
Production of new coloring materials
FR716826A
(en )
1931-12-28
Production of new coloring materials