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US Patent: 871,849
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Patentee: Frank L. Wolfe (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 346/102 Tool Categories: industrial tools : rpm speed gauges and tachometers 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: Jul. 28, 1905 Granted: Nov. 26, 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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