4. Brakes
  5. Vehicle
  6. Railway

Larry G. Keast

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Drilling rig with a top drive with an air lift thread...

Wells – Above ground apparatus – Moving tubing or cable into an existing well
Reexamination Certificate

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Hydraulic fill valve

Measuring and testing – With fluid pressure – Pipe
Patent

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Method for using a top drive with an air lift thread...

Boring or penetrating the earth – With means to simultaneously feed and rotate tool from a...
Reexamination Certificate

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Pawl and ratchet mechanism

Brakes – Vehicle – Railway
Patent

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Power tong apparatus for making and breaking connections between

Tools – Wrench – screwdriver – or driver therefor – Machine
Patent

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Profile ID: LFUS-PAI-P-474209

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