4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
  6. With diversely operated shafts extending into bore

Raymond Perraud

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Device for reaming and collecting dust, for a drilling apparatus

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With diversely operated shafts extending into bore
Patent

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Double acting hydraulic jack with an end of stroke device

Motors: expansible chamber type – Working member position responsive motive fluid control – Venting expanding chamber
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Profile ID: LFUS-PAI-P-1369042

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