![]() They were the (Ml-l-ll US Service gas mask) and the (Ml-l-l US Service gas mask). There were two types of army configurations. The mask was issued in five different sizes with the number on the forehead. In 1921 the Ml US Service gas mask was first issued. The mask was issued in five different sizes. This new mask was the experimental mask 1-1-2 and would be standardized in 1921 as the MI-I-II US Service gas mask. The final step was the facepiece being joined together at the chin. ![]() The rest of the hardware i.e lens crimpings was added afterwards. The facepiece was assembled using a flat sheet of brown gum rubber with a stockinette vulcanized onto the sheet rubber. These changes were with the angle tube assembly, the deflector system, and larger lens crimpings. The US Army ultimately decided to completely re-work the Model of 1919 Design changes. A new type of mask configuration was also being developed using a Model of 1919 facepiece with a 686 mm (27 inch) hose with an MI felt filter with this new carrier. This new type of carrier was meant for filters with inlet valves located on the top of the filter. In 1920 a new type of carrier was standardized known as the Model of 1920 Carrier or the MII. Towards the end of World War I the army was looking to improve upon the Model of 1919 gas mask. A flutter valve controlled outlet from the mask. The problem of lens fogging was reduced by directing the incoming air over the eyepieces. The Model of 1919 and the Akron Tissot masks eliminated the nose clip and mouthpiece of the WWI CE and RFK type box masks. The Model of 1919 Gas Mask originated in World War I and was an improvement over the Akron Tissot masks.
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