4. Expanded, threaded, driven, headed, tool-deformed, or locked-thr
  5. Externally threaded fastener element, e.g., bolt, screw, etc.
  6. Head having counter-sinking means

Yamashina Seiko-sho, Ltd.

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Concrete screw

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head having counter-sinking means
Patent

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Method of ensuring the tightness of a bolt and a nut

Metal working – Method of mechanical manufacture – Assembling or joining
Patent

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