TREA

Mann; Frederick

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  • Columbus, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Self sharpening pencils
    • Patent number 4,334,794
    • Issue date Jun 15, 1982
    • Hay; Cal W.
    • William W. Rader
    • B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES