4. Tool driving or impacting
  5. Impacting devices
  6. With anvil arranged to transmit torsional impact to tool

Elisabeth Hochstrasser nee Wack

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Drilling grab for pile foundations and well boreholes

Boring or penetrating the earth – With means movable relative to tool below ground to stop... – Flow-stopping means includes relatively movable cutter element
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Turning mechanism operating alternately in opposite directions t

Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Patent

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Profile ID: LFUS-PAI-P-1274673

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