* '''2022-04-01:''' Became upgradable from {{Equipment/Link|10cm Twin High-angle Gun Mount}}
* '''2022-04-01:''' Became upgradable from {{Equipment/Link|10cm Twin High-angle Gun Mount}}
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* '''2024-04-30:''' Visible bonuses added when improved (for Akizuki-class), and ingame displayed name harmonized
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* '''2024-04-30:''' Visible bonuses added when improved (for Akizuki-class), <!--name used in the comparison menu changed from "10cm High-angle Gun + Anti-Aircraft Fire Director" (10cm高角砲+高射装置) to "10cm Twin High-angle Gun Mount + Anti-Aircraft Fire Director" (10cm連装高角砲+高射装置)-->