Boring or penetrating the earth
Bit or bit element
Impact or percussion type
Inventor
active
Air-operated self-propelling rotary-percussive downhole drill
Method of controlling the reversing of a device for driving hole
Percussive tool
Reversible air-operated percussive action machine for driving ho
Rock-breaking implement for percussive machines
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Profile ID: LFUS-PAI-P-776411