Hello, Brad. My guess it is used for some type of woodworking. Looks like a quick-adjust mechanism, possibly attach the smaller part of the body to a sawhorse, for gluing. Or maybe a type of flooring clamp. Does the lever on the side engage part of the tool to advance it? Mitchell Mfg. Co. had some sort of connection to Handy, who made a miter clamp, and I believe a few more. Regards, Lou