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There is currently no available "Beginner" label. The following is the default level label: In a letter to Leon Weeks, past President of the Museum of Our Industrial Heritage, the importance of the proximity fuze is described. The radio transmitter component of the fuse was produced in Greenfield, Massachusetts, in a secretive plant owned by the Raytheon Company. The fuse was used in shells to down enemy planes during WWII. The fuze and the manufacture of its components were well kept secrets that helped win the war.