TREA

Guenter E. W. Hagedorn

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  • Minneapolis, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Telephone line control system
    • Patent number 3,943,305
    • Issue date Mar 9, 1976
    • Magnetic Controls Company
    • Guenter E. W. Hagedorn
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE