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US Patent: 873,822
Whistle Valve
Patentee: Frank L. Wolfe (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 137/624.13, 137/624.15, 200/83, 251/14, 251/30.01, 340/404.3, 346/36 Tool Categories: hardware : valves propulsion and energy : steam apparatus : stationary boilers : steam valves Assignees: Crosby Steam Gage & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 05, 1905 Granted: Dec. 17, 1907 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Crosby Steam Gage & Valve Co.

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