Jisho

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戦闘用
Wikipedia definition
1. Combat helmetA combat helmet or battle helmet is a type of personal armor designed specifically to protect the head during combat. Helmets are among the oldest forms of personal protective equipment and are known to have been worn by the Akkadians/Sumerians in the 23rd century BC, Mycenaean Greeks since 17th century BC, the Assyrians around 900 BC, ancient Greeks and Romans, throughout the Middle Ages, and up to the end of the 17th century by many combatants.
Read “Combat helmet” on English Wikipedia
Read “戦闘用ヘルメット” on Japanese Wikipedia
Read “Combat helmet” on DBpedia

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