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Hochtief Ag Vorm. Gebruder Helfmann

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  • Essen, DE
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  • Information Patent Grant

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    • Patent number 4,621,948
    • Issue date Nov 11, 1986
    • Hochtief Ag Vorm. Gebruder Helfmann
    • Volker Hentschel
    • E21 - EARTH DRILLING MINING

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