Medical machines and apparatus, namely, electrocardiographs, electroencephalographs, electromyographs, evoked potential monitors, intra operative monitors, wireless electroencephalography (EGG) and polysomnography (PSG) recorders, polysomnographic apparatus and instruments, blood pressure monitors, patient vital signs monitors, portable bedside monitors for use in monitoring medical patients, central monitoring station for use at a nurses' station that is connected to patients monitors and provides information on patients' conditions, wireless patient monitoring telemetry systems comprised of central monitors, transmitters and receivers, anesthesia gas monitors, capnography monitors and sensors