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US2570553A
|
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Apparatus for blowing or pumping oil wells
|
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US2395119A
|
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Apparatus for blowing oil wells
|
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US2307719A
|
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Hydraulic pump construction
|
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US2243208A
|
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Submersible pump sealing means
|
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US2272771A
|
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Hydraulic pump
|
|
US1816731A
|
|
Oil well pump
|
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US1812784A
|
|
Bearing locking device
|
|
US1774552A
|
|
Steam-boiler structure
|
|
US1709474A
|
|
Welding rod
|
|
US1667253A
|
|
Tie rod for concrete forms
|
|
US1586991A
|
|
Construction of monolithic structures
|
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US1568836A
|
|
Well-pumping machine
|
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US1568835A
|
|
Internal-combustion engine
|
|
US1508100A
|
|
Induction motor and the like
|
|
US1552155A
|
|
Electromagnetic transmission and the like
|
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US1508099A
|
|
Internal-combustion engine and the like
|
|
US1504558A
|
|
Turntable and the like
|
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US1565274A
|
|
Spark plug and the like
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