TREA

Robert R. Spreng

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  • Brookfield, WI, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Key operated shallow penetration lock
    • Patent number 4,561,270
    • Issue date Dec 31, 1985
    • Briggs & Stratton Corp.
    • Robert R. Spreng
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
  • Information Patent Grant

    Weather sealed lock mechanism
    • Patent number 4,006,616
    • Issue date Feb 8, 1977
    • Briggs & Stratton Corporation
    • Hugo G. Rubner
    • E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES