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Electrical detection of acupoints. (A) Punctiform detector equipped with strain gauges to measure the pressure on the skin (inferior line), showing, on the left, detection of the point with a current (superior line) and, on the right, out of the point. (B) Use of the curve plotter (C. Klein, PhD thesis. Montpellier, France: Faculty of Sciences, 1976) for sinusoidal current detection with typical signals: A. resistance; B.diode; and C. capacitor. Used with permission.
