Toy Tricks and Mind Tricks Rabinow and Ordnance An Idea Ahead of Its Time - Notched Disc Memory The Magnetic Particle Clutch Rabinow Engineering 1954-1964 Optical Character Recognition Continuous Ribbon Window Blinds Self-Regulating Clocks and Watches The Sound of Disappointment The Challenge of Everyday Life Perpetum Mobile Inventing for the Fun of It