Word: ballistocardiograms
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Dates: during 1960-1969
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...Warning? The basic model measures head-to-foot and foot-to-head thrusts. A second recording instrument can be added for the sideways thrusts of the blood stream. The recorder has a spare channel, so that if the patient has electrocardiograph leads hooked up the physician can read the ballistocardiogram along with an electrocardiogram...
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