12.7 cm/40 Type 89 naval gun

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Science and technology

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What Wikipedia says

The 12.7 cm/40 Type 89 naval gun (40 Kokei Hachikyu Shiki 12 Senchi 7 Kokakuho) was a Japanese anti-aircraft (AA) gun introduced before World War II. It was the Imperial Japanese Navy's standard heavy AA gun during the war.

Excerpt from the Wikipedia article “12.7 cm/40 Type 89 naval gun”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Furukawa Akira., Public domain, via Wikimedia Commons.