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US Patent: 141,767
Wrenches
Improved Screw-Wrench
Patentee:
Moses G. Crane (exact or similar names) - Newton, MA

USPTO Classifications:
81/77

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
L. H. Latimer
M. W. Frothingham
Francis Gould
Patent Dates:
Applied: Mar. 24, 1873
Granted: Aug. 12, 1873

Patent Pictures:
Moses G. Crane Pat. Aug. 12, 1873
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Description:
Two curved sections with an interposed worm screw on one section and matching threads on the other.

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