Kielland's forceps: variations in design and their practical significance.
D005113:Extraction, Obstetrical; D005260:Female; D005333:Fetus; D006257:Head; D006801:Humans; D009772:Obstetrical Forceps / Q000009:adverse effects / Q000592:standards*; D011247:Pregnancy; D012399:Rotation; D014621:Vagina / Q000293:injuries