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US Patent: 1,978,590
Wrench joint
Patentees: Edward Henry Peterson (exact or similar names) - Chicago, IL Norris F. McNaught (exact or similar names) - Chicago, IL USPTO Classifications: 464/119, 81/177.75 Tool Categories: Assignees: Duro Metal Products Co. - Chicago, IL Manufacturer: Duro Metal Products Co. - Chicago, IL Witnesses: Unknown	Patent Dates: Applied: Jan. 12, 1934 Granted: Oct. 30, 1934 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.

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