TREA

Helmut T. Zwahlen

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  • Athens, OH, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Bicycle pedal reflector
    • Patent number 4,429,950
    • Issue date Feb 7, 1984
    • Helmut T. Zwahlen
    • B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS