Handbook on Pressure Breathing Demand Oxygen Equipment (03-50-31)

Handbook on Pressure-Breathing Demand Oxygen Equipment - T.O No. 03-50-31 - Dated July 1944 -  Contents: Section I: General Information, Section II: A-14 Pressure Breathing Regulator and Description, How regulator works, Operation Instructions, Use of A-14 Regulator with Conventional Demand mask, Inspection , Maintenance and Repair.  Section III:  Pressure Demand Masks - Description, How the Mask Works and Fits, Use of mask with the A-12 Regulator, Preflight Inspection and Test, Hints on reducing discomfort and care of mask.  Section IV: H-2 Emergency Oxygen Cylinder Assembly, General, Operating Instruction and Duration of H-2 oxygen supply.  Includes TO NO's 03-50-26, 03-50-26A, 03-50-28, 03-50-32, 03-50-33