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This device known as a "proximity fuze," or VT (variable timing) fuse was produced by the Raytheon Manufacturing Company, parts which were made in Greenfield, Massachusetts plant, during World War II (WWII). It is a miniature radar set and is utilized to detonate artillery and anti-aircraft projectiles in close proximity to the target. Shown here is a complete variable timing (VT) fuze assembly and a cut-away display model, which shows miniature radio tubes. This technology was considered the third most critical secret program of WWII and dramatically tipped the advantage to the U. S. during the war.