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US Patent: 427,044
Steam Engine Indicator
Patentee: Almon B. Calkins (exact or similar names) - Bridgeport, Fairfield County, CT USPTO Classifications: 92/162R, 92/86 Tool Categories: propulsion and energy : steam apparatus : steam engine indicators Assignees: Ashcroft Mfg. Co. - Bridgeport, Fairfield County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Aug. 05, 1889 Granted: May 06, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Ashcroft Mfg. Co.

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