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US Patent: 1,546,580
Valve
Patentee:
Franklin Hardinge - Chicago, IL

USPTO Classifications:
137/331, 251/278

Tool Categories:
industrial furnaces
specialty machines : industrial furnaces

Assignees:
Hardinge Brothers, Inc. - Chicago, IL

Manufacturer:
Not known to have been produced

Witnesses:
Emile Bourgeois
Edna V. Gustafson

Patent Dates:
Applied: Mar. 15, 1922
Granted: Jul. 21, 1925

Patent Pictures:
USPTO pdf tiff
Google Patents
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"Vintage Machinery" entry for Hardinge Brothers

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