10 Monitoring instruments and apparatus for medical purposes, namely, medical devices for monitoring cardiac activity; physiological monitoring apparatus for medical use, namely, medical devices for monitoring vital signs, blood properties, and respiratory events; medical instruments for recording physiological data, namely, heart activity; electronic analyzers and apparatus for medical purposes, namely, body composition analyzers for medical purposes; medical instruments for reproducing and analyzing physiological data, namely, electrocardiogram monitors for measuring and analyzing heart rate and blood pressure; physiological monitoring, measuring, analyzing and recording apparatus for medical use, namely, electrocardiogram monitors and recorders; computerized medical recording and analysis apparatus, namely, electrocardiogram monitors and recorders; medical diagnostic, examination, analysis and monitoring equipment, namely, electrocardiogram monitors and recorders; medical apparatus and instruments for use in analyzing intracardiac electrograms, namely, electrocardiogram monitors and recorders