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Submarine pen : ウィキペディア英語版 | Submarine pen (詳細はbunker that is designed to protect submarines from air attack. The term is generally applied to submarine bases constructed during World War II, particularly in Germany and the occupied countries, which were also known as U-boat pens (after the phrase "U-boat" to refer to German submarines). ==German submarine pens in World War II==
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「Submarine pen」の詳細全文を読む
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