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US Patent: 713,611
Steam Engine Indicator
Patentee: Theodore Davidson (exact or similar names) - Salem, Essex County, MA USPTO Classifications: 346/5 Tool Categories: propulsion and energy : steam apparatus : steam engine indicators Assignees: Crosby Steam Gage & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 10, 1901 Granted: Nov. 18, 1902 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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