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US Patent: 1,404,771
Compensating Thermometer
Patentee: Frank H. Hopkins (exact or similar names) - Somerville, Middlesex County, MA USPTO Classifications: 374/197, 374/E1.023, 73/708 Tool Categories: gauges : temperature 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. 11, 1917 Granted: Jan. 31, 1922 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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