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US Patent: 1,751,657
Operating mechanism for valve grinders
Patentees:
Norris F. McNaught - Chicago, IL
Edward H. Peterson - Chicago, IL

USPTO Classifications:
74/320

Tool Categories:

Assignees:
Duro Metal Products Co. - Chicago, IL

Manufacturer:
Duro Metal Products Co. - Chicago, IL

Witnesses:
Unknown

Patent Dates:
Granted: Mar. 25, 1930

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"Vintage Machinery" entry for Duro Metal Products Co.
Description:
Duro Metal Products Co. also manufactured woodworking machinery. This valve grinder was sold as the Duro No. 711.

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