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* '''2017-02-28:''' Became '''improvable'''
* '''2017-02-28:''' Became '''improvable'''
* '''2020-06-26:''' Became possible to equip in expansion slots
* '''2020-06-26:''' Became possible to equip in expansion slots
+
* '''2021-06-22:''' Became '''upgradeable''' to {{EquipmentLink|Submarine Radar & Passive Radiolocator (E27)}}
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