This class consisted of MUKO and NANIWA MARUs, both completed in 1937 for Taihei Kisen K.K., a division of Yamashita Kisen K.K. Their commercial service on Taihei Kisen‘s Kobe ~ New Zealand routes came to an end when both were requisitioned by the IJN as auxiliary transports: MUKO MARU, in Dec ‘40, and NANIWA MARU in Oct ‘41. Both were torpedoed and sunk by American submarines: NANIWA MARU in Aug ‘42, W of Truk Atoll and MUKO MARU in Nov ‘43, N of Truk Atoll.
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