CH42566A
(en )
1909-02-01
Process for extracting iron from bauxite
FR5738E
(en )
1906-08-08
Process for extracting copper from its ores
FR360071A
(en )
1906-04-12
Process for extracting copper from its ores
FR6477E
(en )
1906-11-26
Electro-metallurgical process for extracting copper from its ores
FR356098A
(en )
1905-11-20
Process of extracting iron from its ores
FR381642A
(en )
1908-01-16
Ore treatment process for wet metal mining
CH51148A
(en )
1911-08-01
Process of extracting iron from its ores
FR393991A
(en )
1909-01-11
Process for the extraction of nickel from siliceous ores
FR393668A
(en )
1908-12-30
Process for extracting iodine from kelp
FR11034E
(en )
1909-11-26
Copper extraction process from copper tailings
FR375899A
(en )
1907-07-25
Copper extraction process from copper tailings
FR403048A
(en )
1909-10-23
Process and devices for extracting zinc from ores
FR386678A
(en )
1908-06-19
Process for the electrolytic extraction of zinc
FR388708A
(en )
1908-08-20
Process for removing moisture from old walls
FR370803A
(en )
1907-02-20
Process for the electrolytic extraction of zinc from its ores
FR371251A
(en )
1907-03-04
Process for the electrolytic extraction of metals
FR382916A
(en )
1908-02-19
Method and apparatus for iron extraction
FR344301A
(en )
1904-10-31
Process for extracting gold from gold ores
FR401443A
(en )
1909-08-28
Process for extracting metals from ores
FR405030A
(en )
1909-12-17
Process for extracting metals from their ores
FR399901A
(en )
1909-07-10
Process for the direct extraction of iron from ore
FR343114A
(en )
1904-09-26
Process for the direct extraction of zinc from its ores
FR405990A
(en )
1910-01-18
Process for removing iron and germs from water
FR403033A
(en )
1909-10-23
Advanced process for separating and refining metals
CH43665A
(en )
1909-05-17
Process for the electrolytic extraction of copper from copper-containing substances