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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 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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