A practical fetal-heart monitor.
D004560:Electricity; D004562:Electrocardiography; D004864:Equipment and Supplies; D005260:Female; D005333:Fetus / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D007226:Infant Mortality; D010701:Phonocardiography; D011247:Pregnancy; D014159:Transducers