Wortman Leon A creator New York Howard W.Sams 1964 286p What Closed Circuit (Page-9),Cameras (Page-22),Monitors (Page-44),Expanding The Sys (Page-59),Video Recording Tech (Page-91),Closed-Circuit Television (Page-107),Closed Circuit Television In Commerce (Page-132),Closed Circuit Television In Research (Page-168),Lenses, Lighting And Wiring (Page-193),Microwave Replays (Page-213),Circuit And Services (Page-224). Leon A. Wortman Leon A Wortman Closed Circuits 621.38863,WOR 20250926175647.0