Jisho

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Wikipedia definition
1. Spar torpedoA spar torpedo is a weapon consisting of a bomb placed at the end of a long pole, or spar, and attached to a boat. The weapon is used by running the end of the spar into the enemy ship. Spar torpedoes were often equipped with a barbed spear at the end, so it would stick to wooden hulls. A fuse could then be used to detonate it.
Read “Spar torpedo” on English Wikipedia
Read “外装水雷” on Japanese Wikipedia
Read “Spar torpedo” on DBpedia

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