|
US3080808A
|
|
Roof ventilator
|
|
US1113481A
|
|
Apparatus for smelting ores.
|
|
US1026999A
|
|
Process and apparatus for recovering metals from their ores.
|
|
US874537A
|
|
Apparatus for producing wrought iron or steel direct from ore.
|
|
US874536A
|
|
Process of manufacturing wrought iron or steel.
|
|
US821190A
|
|
Apparatus for smelting ores.
|
|
US821189A
|
|
Process of smelting ores.
|
|
US769712A
|
|
Tilting metallurgical furnace.
|
|
US754159A
|
|
Method of treating ores, mattes, &c.
|
|
US731950A
|
|
Coke-oven and gas-producer.
|
|
US693062A
|
|
Manufacture of pig-iron.
|
|
US709112A
|
|
Slag-heating apparatus.
|
|
US731949A
|
|
Method of making coke and gas.
|
|
US710300A
|
|
Method of treating mattes.
|
|
US693313A
|
|
Treating ores or similar materials.
|
|
US660221A
|
|
Manufacture of ordnance and projectiles.
|
