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US Patent: 1,100,756
Double Spring Gage
Patentee: Coleman J. Manning (exact or similar names) - Medford, Middlesex County, MA USPTO Classifications: 73/737 Tool Categories: gauges Assignees: American Steam Gauge & Valve Mfg. Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 25, 1913 Granted: Jun. 23, 1914 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for American Steam Gauge Co.

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