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US Patent: 962,717
Valve for Hammer Drills
Patentee:
Vincent J. O'Brien (exact or similar names) - Denver, Denver County, CO

USPTO Classifications:
173/137, 173/157, 173/36, 91/300

Tool Categories:
industrial tools : pneumatic tools

Assignees:
Vincent J. O'Brien - Denver, Denver County, CO
Romeo C. Awkerman - Denver, Denver County, CO
Thomas Punshon, Jr. - Denver, Denver County, CO

Manufacturer:
Not known to have been produced

Witnesses:
Thomas Punshon, Jr.
Jessie F. Hobart
Otto E. Hoddick
J. D. Thornburgh

Patent Dates:
Applied: May 14, 1909
Granted: Jun. 28, 1910

Patent Pictures: [ 1 | 2 | 3 ]
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