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US Patent: 172,551
Improvement in Coach-Wrenches
James R. Brown - Cambridgeport, MA

USPTO Classifications:
81/124.5, 81/389, 81/DIG4

Tool Categories:
wrenches : pipe and nut combination wrenches

Eliza A. Cloudman - Lynn, MA

Not known to have been produced

S. W. Piper
L. N. Moeller
J. R. Snow
R. H. Eddy

Patent Dates:
Applied: Dec. 01, 1875
Granted: Jan. 25, 1876

Patent Pictures:
James R. Brown Pat. January 25, 1876
USPTO pdf tiff
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The jaw faces are serrated to grip pipe; depending on the handle angle, the angle of the movable jaw can be adjusted relative to its handle, and a screw at the end of the handle can adjust the jaw's position "up and down."

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