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US Patent: 1,370,642
Oil-Test Wrench
Jesse G. Grove - Red Oak, IA

USPTO Classifications:
15/104.05, 15/105, 81/119

Tool Categories:
wrenches : automotive specialty wrenches


Not known to have been produced


Patent Dates:
Applied: Oct. 25, 1920
Granted: Mar. 08, 1921

Patent Pictures: [ 1 | 2 ]
Jesse G. Grove Pat. March 8, 1921
USPTO pdf tiff
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The wrench is made of heavy wire, and a bent metal clip. It is designed to open the oil level and radiator drain cocks on the Model T Ford engine. The short end is designed to clear the center bore of the oil level cock.

A wire wrench conforming to this general idea, with the metal clip and the "poke" on the same end, is shown in 1920s auto supply catalogs.

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