A legalese riddle: What has a main body, a plurality of thrusting operators and rotation members each with at least one signal input element?The answer: U.S. Patent No. 6,231,444 — more commonly known as the DualShock controller for the Sony PlayStation.Introduced in North America in 1998, the device helped solidify contemporary video game consoles, inspired future designs and ignited a generation of first-person …