4. Metal working
  5. Method of mechanical manufacture
  6. Assembling or joining

Earl T. Koskie, Jr.

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Coring tool

Boring or penetrating the earth – With means movable relative to tool to receive – retain – or... – Core-retaining or severing means
Patent

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Method of making a rotary rock bit with seal recess washer

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

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Profile ID: LFUS-PAI-P-496065

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