Jisho

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Noun
1. armor piercing ammunition; armour piercing ammunition
Wikipedia definition
2. Armor-piercing shot and shell1 Light weight ballistic cap 2 Steel alloy piercing shell 3 Desensitized bursting charge 4 Fuse (set with delay to explode inside the target) 5 Bourrelet (front) and driving band (rear)]] An armor-piercing (AP) shell is a type of ammunition designed to penetrate armor. From the 1860s to 1950s, a major application of armor-piercing projectiles was to defeat the thick armor carried on many warships. From the 1920s onwards, armor-piercing weapons were required for anti-tank missions.
Read “Armor-piercing shot and shell” on English Wikipedia
Read “徹甲弾” on Japanese Wikipedia
Read “Armor-piercing shot and shell” on DBpedia

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