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GB264047A
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Improvements in or relating to casing heads for wells
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GB251949A
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Improvements in drilling jars for well boring
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GB264355A
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Packer for oil wells
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GB257822A
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Improvements in deep-well drill-stems
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GB250834A
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Stroke-multiplying parallel-motion device
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GB260379A
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Improvements in and relating to casing heads for oil wells
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GB243619A
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Improvements in jars for use in well drilling operations
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US1547196A
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Control-head-operating means
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US1611709A
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Combined packer and swab
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US1582238A
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Combined casing head and snuffer
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GB239567A
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Method of and apparatus for elevating oil or other liquids from wells
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GB239568A
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Method of making drilling jars for use in drilling wells and the like
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US1564314A
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Construction and arrangement of collapsible jets
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GB225764A
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Improvements in wire cable cutters
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US1637511A
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Method of making drilling jars
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US1586956A
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Combined control head and snuffer
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US1587030A
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Oil-well control-head valve
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GB225417A
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Choke nipple for oil pipe lines
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GB226060A
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Improvements in oil and gas savers for oil and like wells
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GB214171A
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Improvements in means for actuating temper-screws for welldrilling tools
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