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GB1209001A
|
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Well drill pipe protector
|
|
US3449022A
|
|
Drill pipe protector
|
|
US3425757A
|
|
Split drill pipe protector
|
|
US1922386A
|
|
Locking device for swiveling casing hooks
|
|
GB377288A
|
|
Crown blocks for well derricks
|
|
GB376856A
|
|
Improvements in or relating to crown blocks for the derricks of well-drilling plant
|
|
US1817201A
|
|
Cement head for oil wells
|
|
US1812358A
|
|
Oil well packing device
|
|
US1871630A
|
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Thrust bearing
|
|
US1895132A
|
|
Snubbing device for oil well tubing
|
|
US1803721A
|
|
Hoisting clevis
|
|
US1820577A
|
|
Grease packed gland
|
|
US1833172A
|
|
Crown block
|
|
US1794725A
|
|
Lubricating device
|
|
US1889787A
|
|
Device for controlling pressures in oil wells
|
|
GB246027A
|
|
Sheave block
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