fetal Doppler monitors; portable fetal Doppler monitors; probes for fetal Doppler monitors, sterile and non-sterile fetal Doppler monitor probe covers, fetal Doppler monitor probe cases; headphones for fetal Doppler monitors; parts for fetal Doppler monitors, namely, detachable electronic display units to be plugged into the fetal Doppler monitor base unit to show data; accessory kits for fetal Doppler monitors containing probe sheaths, ultrasound gel, batteries, and recording paper