Finally method 'D' dependant on the inflation of the lungs with oxygen under pressure are shown. 1. The McKesson respirator. A portable case on castors is shown holding canisters of oxygen. The patient laying on the floor is readily masked. 2. Oxford respirator shown. Oxford bellows are attached to a tube and they are inflated. A man demonstrates the use of the mask, then it is shown being used on a patient.
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