electro-optical sensors for controlling garage doors, elevator doors and doors of all kinds; for providing an interactive interface between an individual engaging in physical exercise and a video terminal displaying information for monitoring and guiding the exercise program; for controlling the motion of characters or images displayed on a computer video terminal; and for causing the generation or modulation of musical tones

'caus':57 'charact':46 'comput':52 'control':6,42 'display':32,49 'door':8,10,12 'electro':2 'electro-opt':1 'elev':9 'engag':24 'exercis':27,39 'garag':7 'generat':59 'guid':37 'imag':48 'individu':23 'inform':33 'interact':19 'interfac':20 'kind':15 'modul':61 'monitor':35 'motion':44 'music':63 'optic':3 'physic':26 'program':40 'provid':17 'sensor':4 'termin':31,54 'tone':64 'video':30,53

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