* '''2013-04-23:''' '''Implemented''' with initial game release
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* '''2017-01-10:''' Became '''improvable''' and '''upgradeable''' to {{Equipment/Link|New Model High Temperature High Pressure Boiler}}, ability to [[Improving Ship Speed|increase ship speed]] added
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==Akashi's Improvement Arsenal==
==Akashi's Improvement Arsenal==
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==Trivia==
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Resembles a Kampon Steam Boiler, a common type on Japanese Warships.