B62-523. LOT OF FOUR SELF-ADJUSTING PIPE WRENCHES. Craft Design. Uses a unique roller jaw mechanism; patented 11/12/07 by George Heckling to grip the pipe (Schulz #663 and #664) and sold in a wide variety of sizes by the Craftsman Company of Conneault, OH, and later by the Pittsburgh Malleable Iron Co. This lot includes the 8", 10", 18" and 22" sizes. All clearly marked and work smoothly, there's some scattered rust spots but nothing serious. From the collection of Cecil Holmes. Good & better 100-200