https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=24344&pn=168,852 Improvement in Pipe-Wrenches Patentee: William K. Stevens - Mansfield OH Granted:1875-10-19

The patent covers the toothed slide, and the renewable gripping surface. Marketed as the VICTOR ADJUSTABLE PIPE WRENCH. An 1879 ad is reprinted in Ken Cope's "American Wrench Makers 1830-1930." One known example is marked, "Pat. Oct. 19, 1875 // P Lathrop & Co. // Newark, N. J. " Another is marked, "W. K. STEVENS - PAT OCT 19 1875."
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