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The U.S. Army synthetic coronary heart pump become a compact, air-powered unit developed by Kenneth Woodward at Harry Diamond Laboratories in the early to mid-1960s. The Army’s heart pump was in part made of plexiglass, and consisted of two valves, a chamber, and a suction flapper. The pump operated without any transferring components underneath the principle of fluid amplification – presenting a pulsating air pressure source such as a heartbeat.