https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=85332&pn=98,248 Pipe Wrench Patentee: Ebenezer Fisher - Philadelphia PA Granted:1906-03-27

"Girth grip" type pipe wrench with provisions to allow for self-adjustment to conform to small variations in size or surface irregularities in the pipe / tubular form gripped." Some structural details differ from forms shown in corresponding U.S. patents 773,933 and RE12,738.
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