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Keywords: OrdnanceWorldWarII 55.jpg The dimensions of this fuse excluding the whip antenna and battery not pictured were 14 in length and 3 5 in diameter In contrast the later NBS-developed generator-powered proximity fuse for mortars measured only 4 75 in length with an overall diameter of 2 National Institute of Standards and Technology National Institute of Standards and Technology PD-USGov-NIST PD-USGov Cutaways Fuzes of the United States |