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The W58 was an American thermonuclear warhead used on the Polaris A-3 submarine-launched ballistic missile. Three W58 warheads were fitted as multiple warheads on each Polaris A-3 missile. The W58 was in diameter and long, with a basic weight for the warhead of . The yield was 200 kilotons. The W58 design entered service in 1964 and the last models were retired in 1982 with the last Polaris missiles. Researcher Chuck Hansen claims based on his US nuclear program research that the W55 and W58 warheads shared a common primary or fission first stage; this design was nicknamed the Kinglet primary by Hansen in 2001.〔(Beware the old story ) by Chuck Hansen, (''Bulletin of the Atomic Scientists'' ), March/April 2001 pp. 52-55. 〕 ==See also== * List of nuclear weapons 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「W58」の詳細全文を読む スポンサード リンク
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