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  1. 1
    Sound damping drill for shot firing holes - has core of drilling rod surrounded by sound damping material

    Sound damping drill for shot firing holes - has core of drilling rod surrounded by sound damping material von HEIDERICH,ROLF, KLUGE,GUENTHER,.DR

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  2. 2
    Rotary and impact borehole drill operating system - varies frequency and amplitude to reduce power loss and noise (BE 20.3.78)

    Rotary and impact borehole drill operating system - varies frequency and amplitude to reduce power loss and noise (BE 20.3.78) von HEIDERICH,ROLF, KLUGE,GUENTHER,.DR, ECKEY,HORST

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    Patent

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