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US Patent: 378,584
George Gavin - Eureka, NV
Lawrence Washington Cromer - Eureka, NV

USPTO Classifications:

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

Fred M. Heitman - Eureka, NV
George Gavin - Eureka, NV
Lawrence Washington Cromer - Eureka, NV

Not known to have been produced

C. Sedgwick
W. R. Davis
J. F. Acker, Jr.
C. C. Wallace
Wm. H. Sweeney

Patent Dates:
Applied: Jun. 03, 1887
Granted: Feb. 28, 1888

Patent Pictures:
George Gavin and L. W. Cromer patent February 28, 1888
USPTO pdf tiff
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The movable jaw fits in a slot in the main shank. The adjustment collar and finial end nut are held in place by the set screw in the inner retaining collar.

This piece would have a substantial number of small parts requiring significant machine work. It was conceived as a wrench that could be adjusted in confined spaces.

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