"Naval Technical Department (Kampon)" . . "Imperial Japanese Navy Technical Department" . . . "6th Year Type torpedoes" . . . . . . . . . . . . . "Naval Construction Bureau" . "Navy Technical Department" . . . "Technical Department" . "Kampon" . "9th year type mine" . "Naval Shipbuilding Command" . "Navy Technical Bureau" . "Navy Technical Department (Kampon)" . "Kampon Type 1" . "Kampon boilers" . . . "Imperial Japanese Navy Technical Department" . "6th year type torpedo" . "Shipbuilding Division" . . "Kampon boiler" . "IJN Technical Department" . . . "Naval Technical Department" . . . . "6th Year Type" . . "8th year type torpedo" .