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US Patent: 639,812
Monkey Wrench
Improvements in Monkey-Wrenches, Tongs or Similar Tools
Patentee:
Thomas Jensen - Arendal, Norway

USPTO Classifications:
30/189, 81/384, 81/403

Tool Categories:
wrenches : wrench adjustment types : auxiliary levers on wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Isabella Waldron
Halfdan Sommerfeldt
Axel Gottfried Grönn Lahn

Patent Dates:
Applied: Apr. 04, 1898
Granted: Dec. 26, 1899

Patent Pictures:
Thomas Jensen patent Dec. 26, 1899
USPTO pdf tiff
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Description:
The principle of an auxiliary handle providing additional gripping power as applied to various wrench and tongs type tools.

A further development of the tongs type tool received patent no. 644,825 on March 6, 1900.

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