![]() However, the need to move on from primitive features such as mouth-pieces, flutter-valves and box containers was clear and so, development on a new respirator facepiece began. III and II were used with the container which would become the Type A. By 1922, the training container became known as the Type A and the mobilisation container, the Type D.ĭuring the early inter-war years, G. The mobilisation container was based on the 1918 improved container, similar to the US MI Felt Canister (it is unclear which was designed first). The training container was a general upgrade to the late box respirator container, filled only with charcoal. In 1919, policy dictated that two containers should be designed and used by the British Armed Forces, one for training and one for mobilisation.
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