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US Patent: 1,976,938
Pressure Gauge
Patentee: Walter R. Hedeman (exact or similar names) - Baltimore, MD USPTO Classifications: 116/335, 73/431 Tool Categories: gauges : vacuum and pressure gauges Assignees: Ashton Valve Co. - Cambridge, Middlesex County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 23, 1932 Granted: Oct. 16, 1934 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Ashton Valve Co.

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