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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:
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