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GB1273483A
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Tool joint stripping stationary blowout preventer with a retrievable packing insert
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US2218473A
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Swivel
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US2284983A
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Casing head construction
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US2237683A
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Method and apparatus for suspending well casing
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US2168764A
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Blow-out preventer
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US2215049A
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Hook for rotary well drilling
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US2107475A
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Rotary well drilling apparatus
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US2134311A
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Method and apparatus for suspending and sealing well casings
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US2121256A
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Sheave block construction
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US1988442A
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Oil well casing head
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US2009989A
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Oil well casing head
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US1776779A
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Well drilling and pumping apparatus
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US1693039A
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Blow-out device for oil wells
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US1736518A
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Automatic feed-control apparatus for well-drilling mechanisms
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US1789862A
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Safety device for rotating shafts and load indicators
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US1723600A
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Well-packing device
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DE456428C
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Roller block
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US1727583A
|
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Casing head for oil wells
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US1696859A
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Apparatus for dehydrating crude oils
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US1573945A
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Deflector for sheave blocks
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