air craft ▁guns . ▁At ago ▁was ▁repeatedly ▁modern ized ▁and ▁upgrad ed ▁throughout ▁her ▁career ▁in ▁order ▁to ▁counter ▁the ▁growing ▁threat ▁of ▁air ▁strik es , ▁and ▁in ▁her ▁final ▁configuration ▁was ▁armed ▁with ▁ten ▁ 2 0 ▁cm / 5 0 ▁ 3 rd ▁Year ▁Type ▁naval ▁guns ▁( 5 x 2 ), ▁eight ▁Type ▁ 8 9 ▁ ▁dual ▁purpose ▁guns , ▁ ▁( 4 x 2 ), ▁and ▁ 1 6 ▁Type ▁ 9 3 ▁" Long ▁L ance " ▁tor ped o es ▁in ▁four ▁quad ru ple ▁launch ers ▁( plus ▁ 8 ▁re loads ). ▁Anti - air craft ▁protection ▁included ▁ 2 4 ▁triple - mount ▁and ▁ 1 2 ▁single - mount ▁Type ▁ 9 6 ▁ 2 5 ▁mm ▁AT / AA ▁G uns ▁and ▁four ▁ 1 3 . 2   mm ▁AA ▁machine ▁guns . ▁At ago ▁was ▁also ▁equ ipped ▁with ▁an ▁aircraft ▁cat ap ult ▁and ▁carried ▁up ▁to ▁three ▁float plan es ▁for ▁sc out ing ▁purposes . ▁ ▁Service ▁history ▁ ▁Early ▁operations ▁At ago ▁was ▁laid ▁down ▁at ▁K ure ▁Naval ▁Ar sen al ▁on ▁ 2 8 ▁April ▁ 1 9 2 7 , ▁launched ▁on ▁ 1 6 ▁June ▁ 1 9 3 0 , ▁and ▁commission ed ▁into ▁the ▁Imperial ▁Japanese ▁Navy ▁on ▁ 3 0 ▁March ▁ 1 9 3 2 . ▁Although ▁Tak ao ▁was ▁the ▁lead ▁ship ▁in ▁the ▁class , ▁At ago ▁was ▁actually ▁completed ▁two ▁months ▁earlier