TREA

Hans D. Christen

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  • LaVerne, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Rotating spinner irrigation sprinkler
    • Patent number D349752
    • Issue date Aug 16, 1994
    • Rain Bird Sprinkler Mfg. Corp.
    • Hans D. Christen
    • D23 - Environmental heating and cooling
  • Information Patent Grant

    Impact drive sprinkler
    • Patent number D285476
    • Issue date Sep 2, 1986
    • Rain Bird Sprinkler Mfg. Corp.
    • Hans D. Christen
    • D23 - Environmental heating and cooling