TREA

Dittmar Ruffer

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  • D-6200 Wiesbaden, DE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Construction system
    • Patent number 4,228,625
    • Issue date Oct 21, 1980
    • Dittmar Ruffer
    • B28 - WORKING CEMENT, CLAY, OR STONE