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Wikipedia definition
1. QF 2 pounder naval gunThe 2-pounder gun, officially designated the QF 2-pounder (QF denoting "quick firing") and universally known as the pom-pom, was a 40-millimetre (1.6 in) British autocannon, used famously as an anti-aircraft gun by the Royal Navy. The name came from the sound that the original models make when firing.
Read “QF 2 pounder naval gun” on English Wikipedia
Read “ポンポン砲” on Japanese Wikipedia
Read “QF 2 pounder naval gun” on DBpedia

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