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US Patent: 303,752
Monkey Wrench
Patentee:
Gustavus B. Sanborn (exact or similar names) - Bristol, NH

USPTO Classifications:
81/171, 81/437

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Mary M. Page
John C. Page
W. W. Mortimer
E. G. SIggers

Patent Dates:
Applied: May 13, 1884
Granted: Aug. 19, 1884

Patent Pictures:
Gustavus B. Sanborn patent August 19, 1882
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Description:
The three features covered in this patent are:

1) the tapered hole in the stationary jaw which is a socket for a screwdriver or drill bit tang.

2)The set screw adjustment holder on the movable jaw.

3)holes in the adjusting nut to allow a nail or awl to act as a lever to tighten the adjustment.

Ken Cope's "American Wrench Makers 1830-1930" notes an 1888 ad in which Sanborn was offering outright sale or royalty arrangements for the patent.

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