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US Patent: D103,579
Wrench
Patentee:
Norris F. McNaught (exact or similar names) - Chicago, IL

USPTO Classifications:
81/124.4, 81/125.1, D8/28

Tool Categories:
wrenches : automotive specialty wrenches

Assignees:
Duro Metal Products Co. - Chicago, IL

Manufacturer:
Duro Metal Products Co. - Chicago, IL

Witnesses:
none listed
Patent Dates:
Applied: Jan. 18, 1937
Granted: Mar. 16, 1937

Patent Pictures: [ 1 | 2 ]
Norris F. McNaught design patent March 16, 1937
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Description:
The design incorporates multiple hex box and 8-point box openings. Produced as Duro Chrome No. D644 and Indestro Super No. 644.

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