Abstract
References
1.
Bryn Thomas K.
The Development of Anaesthetic Apparatus. Blackwell , London , 1975 .
2.
Charles King A.
Dr. Minnitt's Self-Administered Apparatus for the Midwifery of General Practice. A. Charles King Ltd. , 1936 .
3.
Minnitt R.J.
The History and Progress of Gas and Air Analgesia for Midwifery . Proc Roy Soc Med 1944 ; 37 : 45 .