4. Tools
  5. Wrench, screwdriver, or driver therefor
  6. Having work engaging and force exerting portion inserted...

Mitsuhisa Machida

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Band shaped connected screws with inverse screw threads

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Reexamination Certificate

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Screwdriver used for screw tightener and screw suitably tightene

Tools – Wrench – screwdriver – or driver therefor – Having work engaging and force exerting portion inserted...
Patent

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Profile ID: LFUS-PAI-P-1148907

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