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US Patent: 1,546,580
Valve
Patentee: Franklin Hardinge (exact or similar names) - Chicago, IL USPTO Classifications: 137/331, 251/278 Tool Categories: specialty machines : industrial furnaces Assignees: Hardinge Brothers, Inc. - Chicago, IL Manufacturer: Not known to have been produced Witnesses: Edna V. Gustafson Emile Bourgeois	Patent Dates: Applied: Mar. 15, 1922 Granted: Jul. 21, 1925 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Hardinge Brothers

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