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Shows elementary test01 of linked bi-checks.
Will show elementary test02 of linked bi-checks.
Will show elementary test03 of linked bi-checks.
Will show elementary test04 of linked bi-checks.
Will show extreme load test for bi-check controlling rod.
Will show single bi-check actually towing car.
Will show single bi-check lifting 600lb car engine.
Will show functioning bi-check model.

US Pats & Pats Pend. US.D395,995; US.D425,776; US.D425,399; US.5,829,098; US.5,953,789; US.6,032,331; US.6,397,431; US.6,640,387   Door Butler®,  The Red Thing™,  The Jimmy Clip™,  Charlie™,  Door Genie™, MagChek™, Touch-O-Feather™, and the reddish colored hold-open tab are trademarks of R.A. Products Company Inc.  Copyright © 1996-2004 RAPCO™ & Ricardo Alonso.