|
US773473A
|
|
Filtering apparatus.
|
|
US769938A
|
|
Process of extracting precious metals from ores or slimes.
|
|
US774349A
|
|
Process of filtering slimes.
|
|
US775597A
|
|
Process of extracting gold from ores.
|
|
US722399A
|
|
Barrel-filter.
|
|
US732708A
|
|
Process of extracting gold from ores.
|
|
US732709A
|
|
Appartus for extracting gold from ores.
|
|
US694349A
|
|
Process of recovering gold from refractory ores.
|
|
US694350A
|
|
Apparatus for recovering precious metals from refractory ores.
|
|
CA15517A
|
|
Improvements in treating metals, etc.
|
|
CA15448A
|
|
Improvements in treating metals, etc.
|
|
CA20877A
|
|
Apparatus for the extraction of gold, etc., from ores, etc.
|
|
CA15516A
|
|
Improvements in treating metals, etc.
|
