TY - EJOUR T1 - Equipment for the recording of tractive power in vacuum extractions AU - Saling, E. AU - Blücher, U. AU - Sander, H. PY - 1973 LA - eng PB - Kooperation de Gruyter JO - Journal of Perinatal Medicine - Official Journal of the WAPM DO - 10.1515/jpme.1973.1.2.142 ER -