4. E - Fixed Constructions
  5. 21
  6. B

Martin E. True

E - Fixed Constructions – 21 – B

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Apparatus for use in wells

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Patent

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Combination subsurface safety valve and chemical injector valve

E - Fixed Constructions – 21 – B
Patent

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Power spinner for rotating a kelly joint

E - Fixed Constructions – 21 – B
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Power tong apparatus

E - Fixed Constructions – 21 – B
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Subsurface safety valve

E - Fixed Constructions – 21 – B
Patent

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