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US2226972A
|
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Pump valve
|
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US1734482A
|
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Rotary with power-measuring means
|
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US1751914A
|
|
Pump barrel
|
|
US1711346A
|
|
Safety hook
|
|
US1671581A
|
|
C link
|
|
US1661285A
|
|
Rotary drilling machine
|
|
US1745295A
|
|
Hose connection
|
|
US1722085A
|
|
Rotary drilling machine
|
|
US1671580A
|
|
Flow plug
|
|
US1749809A
|
|
Drive bushing for rotary drilling machines
|
|
US1652857A
|
|
Valve-seat puller
|
|
US1690008A
|
|
Automatic releasing tongs
|
|
US1599087A
|
|
Safety hook
|
|
US1716817A
|
|
Pumping-jack frame
|
|
US1599086A
|
|
Drilling jar and method of making same
|
|
US1700313A
|
|
Hoist drum
|
|
US1660439A
|
|
Electric differential drive for drilling machinery
|
|
US1528417A
|
|
Outboard bearing for steam engines
|
|
US1525292A
|
|
Safety hook
|
|
US1706921A
|
|
Brake mechanism for hoisting drums
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