https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=14947&pn=18,266 Wrench Patentee: Henry D. Blake - New Hartford CT Granted:1857-09-22

The adjustable jaws are arranged in a rough parallelogram. A thumb piece extends toward the handle on the inner jaw segment. Motion of the "T" shaped handle segment opens or closes the jaw opening. Both pipe and nut wrench applications are shown in the patent drawing.
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