U.S.Patent 3013467 1963 First head-mounted graphical display 1963 Concept of Binary-Tree Robotic Manipulator 1967 Serpentine Hydraulic Robot Arm (MIT Museum of Science) 2 EFTA_R1_01688426 EFTA02539828 1970 The "Muse" -- Musical Variation Synthesizer (with E. Fredkin) 1972 First LOGO "turtle" device (with S. Pa