Combined air and water control for stopers
United States Patent 2784701
US Patent References:
Hole-cleansing mechanism
- - 1614026

Rock drill
- - 2251224

Wet and dry back head for rock drills
- - 2562468


Inventors:
Matthew, O'farrell
Publication Date:
03/12/1957
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Assignee:
CHICAGO PNEUMATIC TOOL CO
Primary Class:
173/62
Other Classes:
173/157, 173/161, 173/80, 173/63, 173/65, 91/243, 173/78, 173/36, 173/73
International Classes:
E21B21/14; E21B21/00