were those of the P, QR, QRS, and T waves, the P-R, (P-Q), and the Q-T segments. The amplitudes measured were those of the P, Q, R, S, and T waves and the S-T segment. The resulting measurements were entered on punch cards to permit *A Visicorder, Model 906A, Minneapolis Minnesota, with preamplifiers and amplifiers built by Airborne
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