Dallas, Texas: L. J. Broder Enterprises, Inc. 1978. First Edition. 84 pages including wrappers. Comb bound. Light blue printed wrappers. 8 1/2 x 4 1/2 inches (oblong small 8vo). Light fading to covers. The instruction manual ONLY - does NOT include the trainer. Eight dollars fifty cent cover price. Near Fine. Comb. 
An instruction manual for the Broder Logic Trainer. US Patent 3975836. The trainer was a switch based unit that allowed the user to learn "logic" interactively. With many examples and diagrams. MULTIPLE COPIES AVAILABLE.