title: Apologia: how and why medical sonar developed.
mesh_terms: D002508:Cephalometry / Q000266:history; D004452:Echocardiography / Q000266:history; D004453:Echoencephalography / Q000266:history; D005260:Female; D006176:Gynecology / Q000266:history; D049673:History, 20th Century; D006801:Humans; D006828:Hydatidiform Mole / Q000175:diagnosis; D009774:Obstetrics / Q000266:history; D010048:Ovarian Cysts / Q000175:diagnosis; D011247:Pregnancy; D011258:Pregnancy Tests; D012606:Scotland; D014465:Ultrasonics; D014594:Uterine Neoplasms / Q000175:diagnosis