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US Patent: D45,165
Wrench
Patentee:
Henry Ernest Warren - Lancaster, PA

USPTO Classifications:
81/436, D8/21, D8/29

Tool Categories:
wrenches

Assignees:
Mac-It-Parts Company - Lancaster, PA

Manufacturer:
Not known to have been produced

Witnesses:
Wm. Helmer
Alice Ackroyd
Helen Levan
Harvey B. Lutz

Patent Dates:
Applied: Nov. 13, 1913
Granted: Jan. 13, 1914

Patent Pictures:
H. E. Warren patent January 13, 1914
USPTO pdf tiff
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Description:
The design incorporates a square "driver" with a smaller hexagonal extension.

H.E. Warren was general manager of the Mac-It-Parts Company of Lancaster, PA and hex drive set screws appear to have been one of the company's products.

The patent is noted as a reference in patent no. 2,672,066.

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