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In page Nuclear weapon design:
"After the success of Swan, 28 or 30 centimetres (11 or 12 in) seemed to become the standard diameter of boosted single-stage devices tested during the 1950s.[citation needed] Length was usually twice the diameter, but one such device, which became the W54 warhead, was closer to a sphere, only 38 centimetres (15 in) long.
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