FR722375A
(en )
1932-03-16
Treatment of bronze waste to separate copper, tin, lead and precious metals
GB359570A
(en )
1931-10-19
Improvements in the manufacture of bearing metals
FR820247A
(en )
1937-11-06
Treatment of roasted pyrite residues in order to purify them and separate the copper, zinc and precious metals they may contain
FR727348A
(en )
1932-06-16
Improvements in the treatment of metals and in particular of magnesium and its alloys
FR565353A
(en )
1924-01-25
Improvements in the extraction and refining of metals and alloys
FR563842A
(en )
1923-12-14
Improvements in metal reduction and alloy preparation methods
FR826013A
(en )
1938-03-21
Process for refining zinc alloys and resulting alloys
FR629470A
(en )
1927-11-10
Process for the preparation of alloys of lead and tin which may be obtained from the wastes resulting from the metallurgical treatment of lead
FR862454A
(en )
1941-03-07
Improvements in the treatment of ores by flotation, and in particular of oxidized metal ores, in particular zinc ores
FR606048A
(en )
1926-06-05
Improvements in the treatment of impure metals and impure molten metal masses
FR759767A
(en )
1934-02-09
Improvements in oil treatment
FR584061A
(en )
1925-01-29
Improvements in the treatment of impure metals and alloys
FR811734A
(en )
1937-04-21
Improvements in methods of treating metal surfaces
FR692640A
(en )
1930-11-07
Improvements to the process of extracting tin from ores, alloys, slag and tin waste
GB472248A
(en )
1937-09-20
Improvements in alloys for bearings
FR801338A
(en )
1936-08-01
Process for the extraction of precious metals, particularly applicable to the treatment of poor ores
AU106168B2
(en )
1938-12-22
Improvemnts in and relating to the treatment of gold bearing ores
FR839297A
(en )
1939-03-30
Improvements in the treatment of hydrocarbon oils
FR726466A
(en )
1932-05-30
Improvements in the production and refining of metals
FR765253A
(en )
1934-06-05
Process of refining metals and alloys by the action of added slag in the solid state
FR695623A
(en )
1930-12-18
Improvements in the extraction and refining of metals
FR805480A
(en )
1936-11-20
Improvements to precious metal alloys
FR815992A
(en )
1937-07-27
Safety clasp for earrings and other precious objects
FR765218A
(en )
1934-06-05
Improvements in the treatment of mineral oils
FR689874A
(en )
1930-09-12
Electric shaft furnace for the treatment of metal waste as well as oxidized and sulphurous minerals