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US Patent: 1,877,348
Valve grinder
Patentees:
Edward Henry Peterson - Chicago, IL
Norris F. McNaught - Chicago, IL

USPTO Classifications:
451/117

Tool Categories:

Assignees:
Duro Metal Products Co. - Chicago, IL

Manufacturer:
Duro Metal Products Co. - Chicago, IL

Witnesses:
Unknown

Patent Dates:
Applied: Nov. 09, 1931
Granted: Sep. 13, 1932

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Duro Metal Products Co.

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