TREA

Charles Piotrowski

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  • Suttons Bay, MI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Chuck for tubular workpieces
    • Patent number 4,422,653
    • Issue date Dec 27, 1983
    • Sheffer Collet Company
    • Charles Piotrowski
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • Information Patent Grant

    Collet chuck
    • Patent number 4,094,521
    • Issue date Jun 13, 1978
    • Sheffer Collet Company
    • Charles Piotrowski
    • B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR