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==Notes==
==Notes==
Ships receive a 15% ASW synergy bonus when this is used together with a [[:Category:Depth Charge Projectors|depth charge projector]] or [[:Category:Depth Charges|depth charge]]; and a 43% bonus when all three types are used (must be on the same ship). The 43% bonus does not apply when used together with a [[:Category:Special Depth Charge Projectors|special DCP]].
:Quest reward from the [[Seasonal/Saury 2015#Saury Quests|Saury 2015 Seasonal Event]].
<div class="mw-collapsible"><h3>How To Obtain</h3>
:Quest reward from [[Quests#B42|B42]] and [[Quests#B45|B45]].
<div class="mw-collapsible-content">
'''Buildable'''
'''Stock equipment''' of {{Ship/Link|Asashimo}}, {{Ship/Link|Fukae Kai}}, {{Ship/Link|Hatakaze Kai}}, {{Ship/Link|Hayanami Kai}}, {{Ship/Link|Hiburi Kai}}, {{Ship/Link|Hirato Kai}}, {{Ship/Link|Katori Kai}}, {{Ship/Link|Kishinami Kai}}, {{Ship/Link|Matsukaze Kai}}, {{Ship/Link|Nowaki Kai}}, {{Ship/Link|Shikinami Kai Ni}}, {{Ship/Link|Shimakaze Kai}}, {{Ship/Link|Tanikaze Kai}}, {{Ship/Link|Tsushima Kai}}, {{Ship/Link|Umikaze Kai Ni}} (★+5), {{Ship/Link|Urakaze D Kai}}, {{Ship/Link|Urakaze Kai}}, {{Ship/Link|Yamakaze Kai}}, {{Ship/Link|Yukikaze Kai}}
'''From quests: '''[[Quests#B42|B42]], [[Quests#B45|B45]]
''From limited-time quests: ''[[Quests/Seasonal#SB03|SB03]]
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<div class="mw-collapsible"><h3>Uses</h3>
<div class="mw-collapsible-content">
'''Used to improve''' {{Equipment/Link|Type 93 Passive Sonar}}, {{Equipment/Link|Type 4 Passive Sonar}}
'''Used by quests: '''[[Quests#F50|F50]]
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==Akashi's Improvement Arsenal==
==Akashi's Improvement Arsenal==