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US Patent: 523,020
Wrench
Patentee:
Carl Tinglof - Boston, MA

USPTO Classifications:
81/163, 81/176.3

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches
wrenches : bicycle or pocket wrenches

Assignees:
None

Manufacturer:
Hardy and Carter - Boston, MA

Witnesses:
E. K. Boynton
John F. Nelson
H. E. Lodge
Oscar Anderson

Patent Dates:
Applied: Feb. 14, 1894
Granted: Jul. 17, 1894

Patent Pictures:
Carl Tinglof patent July 17, 1894 with HARDY and CARTER BOSTON PAT PEND.
USPTO pdf tiff
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Description:
The frame and adjustable jaw are connected by a central adjusting screw with left- and right-hand threads. Known examples marked "HARDY & CARTER BOSTON. PAT PEND."

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