|
US1071870A
|
|
Centrifugal concentrator.
|
|
US959838A
|
|
Ore concentrator and classifier.
|
|
US878861A
|
|
Concentrator.
|
|
US779394A
|
|
Latch-finger for stamp-mills.
|
|
US774304A
|
|
Metallurgical process.
|
|
GB190314564A
|
|
Improvements in Metallurgical Furnaces.
|
|
GB190314565A
|
|
Improvements in Metallurgical Furnaces.
|
|
US815937A
|
|
Stamp-mill.
|
|
US815936A
|
|
Stamp-mill.
|
|
US777591A
|
|
Roller crushing-mill.
|
|
US687393A
|
|
Self-fastening shaft-key.
|
|
GB190103453A
|
|
Improvements in or relating to Water-tube Boilers
|
|
US684598A
|
|
Boiler.
|
|
GB190018412A
|
|
Improvements in or relating to Means for Securing, Cams, Pulleys,Couplings, and other Devices to Shafting
|
