TREA

Johann B. Pfeffer

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  • Johannesburg, ZA
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Patents Grantslast 30 patents

  • Information Patent Grant

    Drainage device for particulate material
    • Patent number 4,110,214
    • Issue date Aug 29, 1978
    • S.A. Block & Concrete (Proprietary) Limited
    • Johann B. Pfeffer
    • B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL