https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=85333&pn=RE12,738 Pipe Wrench Patentee: Ebenezer Fisher - Philadelphia PA Granted:1906-01-23

Reissue of 773,933, a "girth grip" type pipe wrench with provisions for adapting grip to allow for small variations in pipe sizes or irregular surfaces. Secondary evidence shows Fisher Wrench Co. operated ca. 1903 - 1911, and likely produced a form of this "friction wrench." Corresponding Canadian patent CA-98,248 shows variant forms for some of the component parts.
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