Anyone familiar with this design? It's a heavy duty animal, and I'm thinking it's a mechanic's or heavy construction tool, rather than a carpenter's tool (and certainly not a cabinetmaker's tool! The size of the ratcheting pawls indicates that the manufacturer expected plenty of grunt to be applied. The jaws are designed for a tapered square shank. Nowadays, we think of those as being for auger bits, but, in the early 20th century, there were a lot of different bits and attachments that used tapered square shanks, so I've posted this question here rather than in woodworking.
One handle is obviously broken and needing repair. Whether I'll ever get a round tuit for that...well, I'm so short on round tuits already!