|
US3040891A
|
|
Oblique vibrating screen device
|
|
US2269787A
|
|
Counterbalancing apparatus
|
|
US2196816A
|
|
Method and apparatus for automatically counterbalancing pumping apparatus on oil wells
|
|
US2184437A
|
|
Counterbalancing system for oil wells
|
|
US2184436A
|
|
Walking-beam and counterbalance construction
|
|
US2231454A
|
|
Orchard protective system
|
|
US2184435A
|
|
Walking beam bearing
|
|
US2122871A
|
|
Method and apparatus for counterbalancing oil well pumping apparatus
|
|
US2040503A
|
|
Material separator
|
|
US2040502A
|
|
Material separation
|
|
US1570085A
|
|
Excavator
|
|
US1357656A
|
|
Panoramic apparatus
|
|
US1265256A
|
|
Settling-tank.
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