TREA

Abraham A. Spiering

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  • Santpoort, NL
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Patents Grantslast 30 patents

  • Information Patent Grant

    Blast furnace taphole drill
    • Patent number 4,456,083
    • Issue date Jun 26, 1984
    • Estel Hoogovens BV
    • Jacobus A. Gozeling
    • C21 - METALLURGY OF IRON