A leg exerciser for medical purposes, comprising a treadle apparatus including a base with a pair of foot pedals mounted thereon, one for each foot, arranged so that when one is pushed downwardly the other must move upwardly with dorsal and plantar flexion, imitating the muscular actions involved in...http://www.google.sh/patents/US4159111?utm_source=gb-gplus-sharePatent US4159111 - Leg exercising apparatus
