2018JIS T 1506:2018 Ultrasonics -- Hand-held probe Doppler foetal heartbeat detectors -- Performance requirements and methods of measurement and reporting
2005JIS T 1506:2005 Ultrasonics -- Hand-held probe Doppler foetal heartbeat detectors -- Performance requirements and methods of measurement and reporting
1984JIS T 1506:1984 Ultrasonic doppler fetal diagnostic equipment