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US Patent: 615,161
Continuous Engine Indicator
Patentee: Thomas Gray (exact or similar names) - Terre Haute, Vigo County, IN USPTO Classifications: 346/118, 346/4, 346/49, 346/72 Tool Categories: propulsion and energy : steam apparatus : steam engine indicators Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 19, 1897 Granted: Nov. 29, 1898 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens The Story of the Steam Engine Indicator

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