TREA

John L. Kettle

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  • Vernon, CT, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Spiral escalator
    • Patent number 4,434,884
    • Issue date Mar 6, 1984
    • Otis Elevator Company
    • John L. Kettle
    • B66 - HOISTING LIFTING HAULING
  • Information Patent Grant

    Racetrack escalator
    • Patent number 4,411,352
    • Issue date Oct 25, 1983
    • Otis Elevator Company
    • John L. Kettle
    • B66 - HOISTING LIFTING HAULING