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GB600294A
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Improvements in or relating to devices for anchoring the hoisting lines of rotary earth-boring apparatus and indicating the line pull thereon
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GB607874A
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Improvements in and relating to pump drives
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GB600488A
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Improvements in and relating to sprocket mountings
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GB603641A
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Improvements in and relating to consolidated rigs for drilling wells or boreholes
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GB551876A
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Improvements in rotary hooks for well drilling
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GB560024A
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Improvements in and relating to well drilling apparatus
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|
GB539179A
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Improvements in hoisting appliances for draw-works and the like
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|
GB542735A
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Anchorages for cables
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GB543261A
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Improvements relating to hoisting blocks
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GB542928A
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Improvements relating to brakes for drawworks and the like
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|
GB523992A
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|
Improvements in and relating to rotary drawworks for well and like drilling plant
|
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GB502533A
|
|
Improvements in and relating to rotary machines for well drilling
|
|
GB492152A
|
|
Improvements in and relating to hooks
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|
GB495747A
|
|
Improvements in and relating to rotary machines for well drilling
|
|
GB500913A
|
|
Improvements in and relating to steam-operated reciprocating pumps
|
|
GB489448A
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|
Improvements in and relating to rotary swivel devices for rotary well drilling apparatus
|
|
GB486133A
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|
Improvements in compression ignition engine and method of operating the same
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|
GB462257A
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|
Improvements in and relating to devices for gripping tubes or pipes in well drilling operations
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|
GB449726A
|
|
Improvements in and relating to rotary machines for well drilling
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|
GB446851A
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Improvements in and relating to rotary swivel devices for well drilling equipment
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