 As far as is known , no radars were installed aboard Mutsu before her loss . While in drydock in May 1943 , a Type 21 air @-@ search radar was installed aboard Nagato on the roof of the 10 @-@ meter rangefinder at the top of the pagoda mast . On 27 June 1944 , two Type 22 surface @-@ search radars were installed on the pagoda mast and two Type 13 early warning radars were fitted on her mainmast . 
