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US Patent: 603,391
Pressure-recorder
Patentee: Frank Leslie Wolfe (exact or similar names) - Medford, MA USPTO Classifications: 346/123, 346/72, 73/712, 73/715 Tool Categories: propulsion and energy : steam apparatus : stationary boilers : steam pressure gauges Assignees: Crosby Steam Gage & Valve Co. - Boston, MA Manufacturer: Crosby Steam Gage & Valve Co. - Boston, MA Witnesses: Arthur L. Bowker Joshua H. Millett	Patent Dates: Applied: Nov. 21, 1896 Granted: May 03, 1898 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Crosby Steam Gage & Valve Co.

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