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US Patent: 822,407
Pipe Wrench
Patentee:
Charles H. Thurston (exact or similar names) - Worcester, MA

USPTO Classifications:
81/107, 81/186

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Fred G. Tilton
M. W. Upham
A. B. Upham

Patent Dates:
Applied: Aug. 19, 1905
Granted: Jun. 05, 1906

Patent Pictures:
Charles H. Thurston patent June 5, 1906
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Description:
Screw adjusting frame, with a compression spring and "plug" to keep the swinging hook jaw "normally closed." The fixed jaw is replaceable.

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