Pulldown device for well drills
United States Patent 2693344
US Patent References:
/1628282.html
- - 1628282

Drilling machine
- - 1682955

Chuck mechanism
- - 2012280

Core drill
- - 2151673

Rotary drilling rig
- - 2188107


Inventors:
Scott, Floyd L.
Publication Date:
11/02/1954
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Assignee:
HUGHES TOOL CO
Primary Class:
173/140
Other Classes:
173/166
International Classes:
E21B19/08; E21B19/00
US Patent References:
2327616Ground rod pusher
2393603Pulldown device