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US1889873A
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Well tube and rotary drill pipe
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US1889872A
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Inserted joint rotary drill stem
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US1936139A
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Rotary drive bushing
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US1889871A
|
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Rotary drill stem, its tube and collar
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US1889870A
|
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Interior shoulder single piece tool joint
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US1889869A
|
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Tube coupling
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US1889868A
|
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Double box rotary tool joint
|
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US1889867A
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Tubular coupling
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US1889866A
|
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Tubular coupling
|
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US1801968A
|
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Drill-stem guide
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US1769381A
|
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Pipe coupling and rotary tool joint
|
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US1794196A
|
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Control mechanism for rotary drill pipes
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US1855556A
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Torsion and coupling controlling device
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US1846348A
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Torsion and coupling controlling device
|
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US1897322A
|
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Torsion and coupling controlling device
|
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US1796611A
|
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Unscrewing preventer
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US1749981A
|
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Method of making drill stems
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US1714613A
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Bed for vehicles
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US1623885A
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Casing slip
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US1674215A
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Bed for vehicles
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