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US Patent: 665,154
Pressure Recorder
Patentee: Frank L. Wolfe (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 346/123, 346/139C, 346/72, 73/712 Tool Categories: propulsion and energy : steam apparatus : steam engine indicators industrial tools : pressure indicators industrial machines : industrial recording apparatus Assignees: Crosby Steam Gage & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 14, 1900 Granted: Jan. 01, 1901 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens The Story of the Steam Engine Indicator "Vintage Machinery" entry for Crosby Steam Gage & Valve Co.

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