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US Patent: 1,176,417
Counter Pressure Valve
Patentee: Robert Wood (exact or similar names) - Brooklyn, NY USPTO Classifications: 137/630.11, 137/630.13 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: Nathan Mfg. Co. - New York, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 20, 1915 Granted: Mar. 21, 1916 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Nathan Mfg. Co.

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