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US Patent: 1,751,657
Operating mechanism for valve grinders
Patentees:
Edward H. Peterson (exact or similar names) - Chicago, IL
Norris F. McNaught (exact or similar names) - 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

Patent Pictures:
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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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