Word: cardiograph
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Dates: during 1950-1959
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...whale was wildly uncooperative. It thrashed about the bay for an hour while the doctor clung to the gunwale. Amidships, a cardiograph expert crouched over his instrument and worked desperately with the controls. Somehow he managed to get a two-minute record of the plunging whale's heartbeats. The spray-drenched scientists went happily away, clutching the first such record in medical history...