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Atmas SO-1 type door prototype in a new production line Atmas Group  is glad to launch the new production line of ATM SO-1 type doors for civil defence shelters and protected facilities also in Estonia along with production in other locations. The doors are designed to comply and in some criteria to surpass the requirements of S1 shelter norms in Finland. ATM SO-1 locking mechanism operation Atmas ATM SO-1 shelter blast door locking mechanism operation principal with four loc