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US Patent: 1,978,590
Wrench joint
Patentees:
Edward Henry Peterson - Chicago, IL
Norris F. McNaught - 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 pdf tiff
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"Vintage Machinery" entry for Duro Metal Products Co.

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