![]() ![]() In 1934 the second alteration was made resulting in the lower harness tab being lengthened and it was made in a universal size. No other filters and carriers would be issued with The MIA1 During its service life The Resulting kit would be designated MIA1-IV-III US Service Respirator. It was meant for filters with inlet valves on the bottom. A new carrier was issued known as the MIII. ![]() This new Facepiece would also be issued with a new filter known as the MIV which had an inlet valve on the bottom rather than the top like the MI and MII felt filter. The MIA1 Was issued in four sizes with US and the number on the forehead. It would still use the MII Head harness and the MI Outlet valve. In 1928 the first alteration to the facepiece was made resulting in threaded lenses so the lenses could be replaced. The only difference from the Ml US Service Respirator is that the navy used the Mlll coil spring harness. ![]() The navy also used a variant of the Ml US Service Respirator known as the Mkl navy gas mask. There’s an example one of these masks Displayed at the gas mask Dash Down at Edgewood Maryland. Later production MI Service masks also used the MII Felt filter(MI-II-II US Service Respirator). Some early Ml US Service masks used a black rubber band to cover the wire and tape around the angle tube assembly. The MI US Service mask Used the MI Outlet valve. The Ml was adjusted from the head pad with the straps sewn to the facepiece tabs. The Mll was adjusted from the facepiece. The Ml facepiece also used two types of head harnesses. The only difference between the two is that the Ml-l-ll had a twenty 178 mm (7 inch) Mll hose and Mll carrier while the Ml-l-l used a 254 mm (10 inch) hose with Ml chest carrier. They were the (Ml-l-ll US Service gas mask) and the (Ml-l-l US Service Respirator). 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 respirators. The Model of 1919 Gas Mask originated in World War I and was an improvement over the Akron Tissot masks. ![]()
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