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After the war, the reputation of the brand earned them numerous new contracts with extremely high-profile companies. For example, they worked for the United States Government, manufacturing the doors for missile silos and for other security features. Mosler even built the vault used to display the U.S Constitution and Declaration of Independence.

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The logic behind the vault technology was a 138-ton blast door, which was considered the largest and heaviest door in the world. This door was installed at the Atomic Energy Commission’s Oak Ridge National Laboratory. However, this door, the heaviest in the world, could in fact be opened by just one person.