CH51148A
(en )
1911-08-01
Process of extracting iron from its ores
FR356098A
(en )
1905-11-20
Process of extracting iron from its ores
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
FR441697A
(en )
1912-08-13
Process for extracting zinc from its ores
FR403048A
(en )
1909-10-23
Process and devices for extracting zinc from ores
CH42566A
(en )
1909-02-01
Process for extracting iron from bauxite
FR405030A
(en )
1909-12-17
Process for extracting metals from their ores
FR10737E
(en )
1909-09-10
Process for the direct extraction of iron from ore
FR343114A
(en )
1904-09-26
Process for the direct extraction of zinc from its ores
FR399901A
(en )
1909-07-10
Process for the direct extraction of iron from ore
CH50730A
(en )
1911-07-01
Electro-metallurgical process for the direct extraction of iron, industrially pure from its ores
FR437841A
(en )
1912-05-01
Process for extracting metals from ores
FR370803A
(en )
1907-02-20
Process for the electrolytic extraction of zinc from its ores
FR440712A
(en )
1912-07-19
Process for the extraction of copper from sulphide ores, and other materials
FR354688A
(en )
1905-10-10
New process for extracting sulfur from sulfur soil and sands
FR359434A
(en )
1906-03-26
Process for extracting lead and silver from their ores
CH48387A
(en )
1910-10-17
Electrometallurgical process for the extraction of zinc from mixed sulphide ores of zinc and lead
FR381642A
(en )
1908-01-16
Ore treatment process for wet metal mining
FR367368A
(en )
1906-10-27
Furnace for the extraction of zinc from its ores
FR428521A
(en )
1911-09-01
Process and devices for the extraction of metals from their ores
FR429319A
(en )
1911-09-20
Metal extraction process by leaching
FR410145A
(en )
1910-05-12
Improvements in the process of extracting iron from ores, and preparations of iron alloys
FR403623A
(en )
1909-11-10
Iron ore processing process