B66-526 PIPE WRENCH. Marked only "Pat. Appl'd For" and we're not familiar with it. 10" long, self-adjusting jaws that close as the wrench is rotated; in this case a hook on the handle forces the jaws closed. The hook could also serve as pry bar, and there's a screwdriver blade on the end that makes us think it was designed a combination tool. Well made, rust free, and works smoothly. From the collection of David Jeffers. Fine 100-200