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US Patent: 1,793,714
Duplex Wrench
Patentee:
Emil Newberg - Brockton, Plymouth County, MA

USPTO Classifications:
81/125.1, 81/177.1

Tool Categories:
wrenches : nut wrenches
wrenches : wrench components : wrench handle components

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Apr. 14, 1928
Granted: Feb. 24, 1931

Patent Pictures:
Emil Newberg patent Febr. 24, 1931
USPTO pdf tiff
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Description:
The twist puts the head in the hand flat to the palm rather than "edge on," -- "to enable the user to manipulate the wrench without discomfort."

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