|
US2545295A
|
|
Swing
|
|
US2443191A
|
|
Resilient safety belting
|
|
US2287483A
|
|
Mud pump piston
|
|
US2189349A
|
|
Mud pump piston
|
|
US2175442A
|
|
Mud pump piston
|
|
US2175441A
|
|
Mud pump piston
|
|
US1882156A
|
|
Expansible packing for plungers
|
|
US1806078A
|
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Expansible packer for hydraulic plungers
|
|
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|
|
Expansible piston
|
|
US1716896A
|
|
Mud-pump valve
|
|
US1569560A
|
|
Expansible packing for plungers
|
|
US1579127A
|
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Expansible packer for plungers
|
|
US1613355A
|
|
Expansible packing
|
|
US1622043A
|
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Expansible packer for plungers
|
|
US1612039A
|
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Expansible packer for hydraulic plungers
|
|
US1531242A
|
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Expansible packer for hydraulic plungers
|
|
US1612038A
|
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Expansible packer for hydraulic plungers
|
|
US1641547A
|
|
Expansible packing
|
|
US1699475A
|
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Valve grinder
|
|
US1489609A
|
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Expansible-piston-packing retainer
|
