4. Tools
  5. Wrench, screwdriver, or driver therefor
  6. Machine

Walter W. Svendsen

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Dry hole wire core barrel apparatus

Handling: hand and hoist-line implements – Grapple – Well type
Patent

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High-low speed rotary drive mechanism

Machine element or mechanism – Gearing – Plural prime movers selectively coupled to common output
Patent

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Rod break-out and make-up tool

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

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Profile ID: LFUS-PAI-P-1527582

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