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No.1-class submarine chaser
The was a class of submarine chasers of the Imperial Japanese Navy (IJN), serving during World War II. Three vessels were built in 1933-36 under the Maru 1 Programme and the Maru 2 Programme. They have two sub classes, this article handles them collectively.
==Background==
* In World War I, German U-boat raged. The IJN began maintenance of an anti-submarine boat as a lesson in this, because Japanese shoreline and sea-lanes were very long. The IJN had some submarine chaser type tugboats and yard ferries. However, they were small and their speed was low.
* The IJN wanted to give the anti-submarine boats a speed of more than 20 knots, because their ''Kaidai III'' submarine already achieved a 20kt surfaced.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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