TY  - RPRT
TI  - [The vacuum extractor].
AU  - W D CUNNINGHAM
PY  - 1958
DO  - 10.5694/j.1326-5377.1958.tb86605.x
UR  - https://pubmed.ncbi.nlm.nih.gov/13551426/
ID  - 13551426
ER  -