aj ima ▁replaced ▁the ▁engine ▁with ▁a ▁ ▁Br istol ▁Jup iter ▁radial ▁engine , ▁also ▁license - built ▁in ▁Japan , ▁and ▁later ▁by ▁its ▁own ▁Nak aj ima ▁Kot ob uki ▁ ▁engine . ▁ ▁Nak aj ima ' s ▁production ▁began ▁in ▁September ▁ 1 9 3 0 , ▁with ▁the ▁first ▁aircraft ▁delivered ▁in ▁March ▁ 1 9 3 1 . ▁Production ▁ended ▁in ▁October ▁ 1 9 3 6 , ▁but ▁the ▁total ▁number ▁of ▁aircraft ▁built ▁is ▁unknown . ▁Nak aj ima ▁also ▁sub - lic ensed ▁additional ▁production ▁to ▁its ▁subs idi ary ▁Mans h ū k oku ▁H ik ō ki ▁Se izo ▁K K ▁in ▁Man ch u ku o , ▁which ▁also ▁produced ▁an ▁unknown ▁number ▁of ▁units . ▁The ▁first ▁military ▁Super ▁Univers als ▁were ▁introduced ▁into ▁service ▁following ▁Japan ' s ▁invasion ▁of ▁Man ch uria ▁in ▁ 1 9 3 1 ▁when ▁the ▁Imperial ▁Japanese ▁Army ▁comm ande ered ▁seven ▁Super ▁Univers als ▁from ▁the ▁Japan ▁Air ▁Transport ▁Company . ▁ ▁In ▁ 1 9 3 2 , ▁the ▁Imperial ▁Japanese ▁Army ▁Air ▁Force ▁decided ▁to ▁ac quire ▁its ▁own ▁trans ports , ▁which ▁it ▁designated ▁as ▁the ▁Army ▁Type ▁ 9 5 ▁Training ▁A ircraft ▁under ▁the ▁former ▁aircraft ▁naming ▁nom en cl ature ▁system , ▁or ▁Ki - 6 ▁under ▁the ▁new ▁system . ▁The ▁first ▁aircraft ▁was ▁delivered ▁as ▁a ▁flying ▁amb ul ance ▁fitted ▁with ▁two ▁stretch ers ▁and ▁three ▁seats . ▁This ▁was ▁followed ▁by