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US Patent: 899,462
Air-valve for hydraulic jacks
Patentees: William H. Mathers (exact or similar names) - New York, NY James W. Nelson (exact or similar names) - New York, NY USPTO Classifications: 137/43, 137/533.11 Tool Categories: material handling : jacks : hydraulic jacks Assignees: William M. Dudgeon - New York, NY Manufacturer: Not known to have been produced Witnesses: James Moore M. G. Glen	Patent Dates: Applied: May 23, 1907 Granted: Sep. 22, 1908 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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