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US Patent: 514,477
Wrench
Patentee:
John U. Kraft (exact or similar names) - Milwaukee, WI

USPTO Classifications:
279/6, 81/446

Tool Categories:
wrenches

Assignees:
John U. Kraft - Milwaukee, WI
William Koester - Milwaukee, WI

Manufacturer:
Not known to have been produced

Witnesses:
Geo. W. Young
N. E. Oliphant
Henry Dankert
Patent Dates:
Applied: Oct. 27, 1893
Granted: Feb. 13, 1894

Patent Pictures:
John U. Kraft patent February 13, 1894
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Description:
The central internal shaft has eccentric cam action to force surrounding rings outward against the interior face of a barrel bung bushing.

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