Electrocardiac instrument for testing unborn infants
作者： James J Egan
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lens.org 参考文章(3)
Jr Grover C Backster, Method and apparatus for measuring and recording group reactions ,(1957)
William A Lurie, Binder for securing medical electrodes ,(1925)
Kenneth G Lansford, Suzanne B Knoebel, Robert J Braunlin, Jr Charles A Hunter, Method for obtaining a fetal electrocardiogram ,(1960)