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US Patent: 640,308
Wrench
Patentee:
Henry E. Koch (exact or similar names) - Hartington, NE

USPTO Classifications:
81/112, 81/180.1

Tool Categories:
wrenches : pipe wrenches : pipe tongs

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
G. N. Champion
W. H. Martin
Otis D. Swett
J. D. Gray

Patent Dates:
Applied: Apr. 22, 1899
Granted: Jan. 02, 1900

Patent Pictures:
Henry E. Koch patent January 2, 1900
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Description:
Variations of clamping jaws which are tightened by a screw withdrawing from the end of the handle, connected to the jaws by an intermediate link. The jaws could have teeth for pipe, or be used for blacksmith tongs.

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