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US Patent: 873,754
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Patentee: Philip L. Johnson (exact or similar names) - Somerville, Middlesex County, MA USPTO Classifications: 235/113, 235/120, 235/144SP, 235/97 Tool Categories: industrial tools : rpm speed gauges and tachometers Assignees: Crosby Steam Gage & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 11, 1906 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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