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US Patent: 1,752,425
Wrench
Patentee:
Amos K. Ersland - Manhattan Beach, CA

USPTO Classifications:
81/116, 81/386, 81/391

Tool Categories:
wrenches : pliers type wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Apr. 22, 1929
Granted: Apr. 01, 1930

Patent Pictures:
Amos K. Ersland patent April 1, 1930
USPTO pdf tiff
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Description:
Pliers type wrench with a sliding wedge size adjustment. The jaws remain roughly parallel through the range of sizes.

One known example appears to be hand made and may be a prototype.

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