Shorte No. 16, 18 and 20 Rolloseam Lock Forming and Flanging Attachment. Rolloseam Flanging Machines Models 16, Button Punch and Autoguide, Button Punch Snap Lock Forming Machine, Rolloseam Cleat Forming Machines, Operating Instructions with Parts as Exploded Component Drawings and Electrical Circuit Diagrams. Includes a very useful copy of "Procedures and Practices in the Fabrication of Ducting" (with wide-ranging instructions in calculating, forming corner joints and seams, angle and bar cleats, making a Pittsburgh lock and right angle flanges, button-punch snap locks, using the cleat cutter attachment, joining ducts, etc, etc. A complete set of technical Sales and Specification folders for the various machines is also included.