|
US1959934A
|
|
Cooling unit for refrigerating systems
|
|
US1892740A
|
|
Metals reduced from their oxides without melting
|
|
US1928140A
|
|
Method of reducing metallic oxides
|
|
US1775358A
|
|
Uniting of iron with other metals and elements
|
|
US1851376A
|
|
Treating and recovery of gangue from metals
|
|
US1951449A
|
|
Process of reducing and alloying metals
|
|
US1846530A
|
|
Process of reducing iron ore without melting
|
|
US1692588A
|
|
Method of reducing metallic oxides
|
|
CA315700A
|
|
Process of forming iron alloy articles
|
|
CA326555A
|
|
Alloy production
|
