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US Patent: 1,363,415
Differential Pressure Gage
Patentee: Frank H. Hopkins (exact or similar names) - Somerville, Middlesex County, MA USPTO Classifications: 73/736 Tool Categories: gauges : vacuum and pressure gauges industrial tools : pressure indicators Assignees: American Steam Gauge & Valve Mfg. Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 07, 1917 Granted: Dec. 28, 1920 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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