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US Patent: 1,613,981
Wrench
Patentee:
August Edwin Carlberg - Worcester, Worcester County, MA

USPTO Classifications:
81/124.5, 81/125.1

Tool Categories:
wrenches : socket wrenches

Assignees:
Walden-Worcester Inc. - Worcester, Worcester County, MA

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Jun. 10, 1924
Granted: Jan. 11, 1927

Patent Pictures:
August E. Carlberg patent January 11, 1927
USPTO pdf tiff
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Description:
Spring / ball retaining means for rotating socket heads; Carlberg's prior patents 1,542,336 and RE,16,354 are the underlying wrench structure.

Compare W. S. Bellows' parallel patent no. 1,613,976 also assigned to Walden-Worcester.

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