TREA

Guenter E. Hagedorn

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  • Minnetonka, MN, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    PBX voice mail interface
    • Patent number 4,930,153
    • Issue date May 29, 1990
    • Nicollet Technologies, Inc.
    • Guenter E. Hagedorn
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Universal PBX interface
    • Patent number 4,914,690
    • Issue date Apr 3, 1990
    • Nicollet Technologies, Inc.
    • Guenter E. Hagedorn
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Hand-held telephone line signaling test instrument
    • Patent number 4,843,620
    • Issue date Jun 27, 1989
    • Nicollet Technologies, Inc.
    • Guenter E. Hagedorn
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE