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GB354086A
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Improvements in drive bushings for rotary well drilling machines
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GB327897A
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Improvements in tongs or wrenches for use in connection with oil or like drilling operations
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GB316832A
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Improvements in safety hooks
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GB323333A
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Improvements in spider and slip constructions for use in well drilling operations
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GB309850A
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Improvements in swivels for rotary well drilling apparatus
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GB309397A
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Improvement in electric differential drive for drilling
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GB295147A
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Improvement in automatic releasing tongs
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GB290068A
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Tong support for earth boring apparatus
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GB280080A
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Improvements in rotary well and like drilling machines
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GB266215A
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Improvements in and relating to the manufacture and construction of jars for use in well drilling and like operations
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GB255253A
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Improvement in travelling blocks
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GB239094A
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Improvements in rotary earth boring apparatus
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GB221336A
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Improvements in rotary apparatus for earth boring
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GB189907A
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Rotary drilling machines for drilling wells or the like
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GB185465A
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Improvements in rotary drilling apparatus
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GB177578A
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An improved rope socket or swivel jar for use in connection with well drilling tools or apparatus
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