Any idea what this Snap-On tool is for?
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I can see how they could be used for something like that but the crimp area is only ~ 1/4" long. They do have the same B 269 markings as the example above.The Utica pliers look like perhaps they're intended to manually pinch-off copper tubulations. Sometimes those are part of a hermetically sealed assembly of some sort (say high performance contactors like these: Sensata | Gigavac | Sensata Technologies - https://www.sensata.com/gigavac-redirect) and sometimes they're part of a refrigeration system. I will speculate that the double pivot is a means of increasing the force at the jaws.