TREA

Robert W. Harper

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  • Stoke-on-Front, GB
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Patents Grantslast 30 patents

  • Information Patent Grant

    Sluice gate or penstock door
    • Patent number 5,129,147
    • Issue date Jul 14, 1992
    • Simon-Hartley Limited
    • Eric P. Austin
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
  • Information Patent Grant

    Sluice gate or penstock door
    • Patent number 5,129,195
    • Issue date Jul 14, 1992
    • Simon-Hartley Limited
    • Eric P. Austin
    • E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING