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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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin 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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