automatic and semiautomatic defibrillators, patient simulators for automatic defibrillators, external transchest pacemakers, ECG and voice recorders, and accessories therefor, namely, disposable defibrillation electrodes, disposable pacing electrodes, patient cables, battery chargers, battery dischargers, wall mounting racks for battery chargers, ECG modulators, ECG demodulators, ECG telemetry systems including RF transmitters and receivers, emergency carts for transporting combination heart monitor and defibrillator units, lead selectors for patient-engaging electrodes, prejelled patient-engaging electrodes, internal paddle handles, accessory bags, carrying cases, pediatric paddle attachments for defibrillator patient-engaging electrodes, batteries and ECG recorder paper