 SM UB @-@ 15 ( became the Austro @-@ Hungarian U @-@ 11 , June 1915 ) 
 SM UB @-@ 15 ( became the Austro @-@ Hungarian U @-@ 11 , June 1915 ) 
SM UB @-@ 15 ( became da Austro @-@ Hungarian U @-@ 11 , June 1915 )