Electrocardiogram is a written record of a heart beat, while electrocardiograph is an instrument with which it is recorded. The same is true for telegram, written record, and telegraph, the instrument.
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(2010). What Is the Electrocardiogram or ECG?. In: The Minnesota Code Manual of Electrocardiographic Findings. Springer, London. https://doi.org/10.1007/978-1-84882-778-3_1
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