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Wikipedia definition
1. Butterfly BombA Butterfly Bomb (or Sprengbombe Dickwandig 2 kg or SD2) was a German 2 kilogram anti-personnel submunition used by the Luftwaffe during the Second World War. It was so named because the thin cylindrical metal outer shell which hinged open when the bomblet deployed gave it the superficial appearance of a large butterfly. The design was very distinctive and easy to recognise.
Read “Butterfly Bomb” on English Wikipedia
Read “SD2” on Japanese Wikipedia
Read “Butterfly Bomb” on DBpedia

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