4. Boring or penetrating the earth
  5. With means to feed drive

Marion E. Heller

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Exploration-sampling drilling system

Boring or penetrating the earth – With means to feed drive
Patent

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Multi-walled drill string for exploration-sampling drilling syst

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Profile ID: LFUS-PAI-P-1078763

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