‘heartbeat’ historical pictures (exact matches)

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A 19th century stethoscope witha bell-shaped end
A 19th century stethoscope witha bell-shaped end
Miniature external cardiac pacemaker, Welwyn Garden City, En
Miniature external cardiac pacemaker, Welwyn Garden City, En
Electronic foetal monitoring system, United Kingdom, 1980
Electronic foetal monitoring system, United Kingdom, 1980
A 19th century stethoscope witha bell-shaped end
A 19th century stethoscope witha bell-shaped end
Mechanical wonders from many countries
Mechanical wonders from many countries
So That's Why… Physicians are called Doctors but Surgeons are Misters
So That's Why… Physicians are called Doctors but Surgeons are Misters
Ultrasonic foetal heart monitor, England, 1973–1978
Ultrasonic foetal heart monitor, England, 1973–1978
A 19th century stethoscope witha bell-shaped end
A 19th century stethoscope witha bell-shaped end