Apparatus for printing alpha-numeric characters for plotting an incoming signal at rates on the order of one page every seven seconds for rapidly verifying that the system producing the incoming signal is operating properly. Both printing and plotting are done by styli mounted on a moving carriage and...http://www.google.fr/patents/US4422081?utm_source=gb-gplus-shareBrevet US4422081 - Validator for electrocardial data processing system
Validator for electrocardial data processing system
