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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 Patent Pictures: USPTO Images Google Patents Report data errors or omissions "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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