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US Patent: 787,422
Whistle Valve
Patentee: Frank L. Wolfe (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 116/137, 251/29, 251/30.02, 251/44, 261/DIG.53, 340/404.3 Tool Categories: propulsion and energy : steam apparatus : steam valves hardware : valves propulsion and energy : steam apparatus : steam whistles Assignees: Crosby Steam Gage & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 15, 1904 Granted: Apr. 18, 1905 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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