NL992C
(en )
1915-11-24
Method for treating gold and silver ores that are difficult to extract
NL25191C
(en )
1931-11-16
Method and device for sorting and separating ore-containing material
NL1767C
(en )
1917-01-15
Improvement in an apparatus for extracting tin, gold and other ores from sand or other ore-bearing soil
NL1716C
(en )
1916-11-15
Method of processing peat
NL488C
(en )
1915-01-15
Method of collecting and guiding tree sap
NL440C
(en )
1916-12-01
Improvement in devices for electrically protecting metal surfaces against oxidation
NL522C
(en )
1915-02-01
Process for preparing hydrogen from metals, resp. lower metal oxides and water
NL875C
(en )
1915-11-01
Improvement of a method of removing water from peat and the like
NL323C
(en )
1914-09-15
Method for tanning fish skins and the like
NL1481C
(en )
1917-03-15
Device for preparing and injecting gases
NL1641C
(en )
1916-11-15
Method for manufacturing peat-coal briquettes
NL1385C
(en )
1916-07-01
Method of processing waste and garbage
NL931C
(en )
1915-11-15
Method and device for finishing the edges of leatherwork
NL620C
(en )
1915-04-01
Method of preparing hydraulic cement
NL1625C
(en )
1916-10-16
Method for manufacturing metal sheets or wires provided with patterns for jewelry and the like
NL1336C
(en )
1916-06-01
Method for the rapid tanning of hides
NL1746C
(en )
1917-01-02
Method for unlocking minerals
NL9C
(en )
1913-07-01
Method of marking cheese
NL1440C
(en )
1916-07-15
Method for treating fishing nets
NL771C
(en )
1915-08-02
Apparatus for binding sheaves and the like together
NL1439C
(en )
1916-09-04
Method and device for manufacturing so-called press decorations
NL475C
(en )
1915-02-01
Process for treating suspended substances
AT82858B
(en )
1921-02-25
Method and device for casting ingots or blocks made of metal or metal alloy.
FR483469A
(en )
1917-07-11
Method and apparatus for extracting zinc from zinciferous ores
NL476C
(en )
1915-01-15
Method for the electrolytic deposition of metals on iron and steel