A hydraulic exercise machine which employs the use of a fluid actuator and a servo pump mechanism controlled by an integrated microprocessor device. The dedicated microprocessor control is pre-programmed to provide the user with three (or more) exercise modalities; a manual mode, in which the user independently...http://www.google.fr/patents/US4865315?utm_source=gb-gplus-shareBrevet US4865315 - Dedicated microprocessor controlled exercise resistance machine
