How many naval guns did these battleships carry, in which the Japanese aircraft carrier Shinano was the third of these battleships?
Japanese aircraft carrier Shinano:  Laid down in May 1940 as the third of the "Yamato"-class battleship s, "Shinano"' s partially complete hull was ordered to be converted to a carrier following Japan's disastrous loss of four fleet carriers at the Battle of Midway in mid-1942. Yamato-class battleship: The "Yamato"-class battleships (大和型戦艦 , Yamato-gata senkan ) were battleships of the Imperial Japanese Navy (IJN) constructed and operated during World War II. Yamato-class battleship:  The class carried the largest naval artillery ever fitted to a warship, nine 460-millimetre (18.1 in) naval guns, each capable of firing 1460 kg shells over 42 km .
nine