The patent shows a simpler wrench of a different shape but apparently, they felt the description would apply to both designs.
From the patent description; "The curved face of the hook is to better fit tapered curved lugs on fire hose couplings. The hook is large enough to catch on a ladder rung. The wide opening on the end of the handle is for a strap to connect the tool to a hose when the tool is used to hang hose from a ladder".
A nice decorative object, not sure there would be any real use for something like this today.
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