Electronics Material Officer. Naval Education and Training Program Development Center. https://www.google.co.jp/books/edition/Shipboard_Electronics_Material_Officer/tp3Hc_nd3IkC
(150 mm). The penetration of the 10-インチ (250 mm) projectile will therefore be between six and seven feet into the same material. To use a more familiar
Intelligence System JN-144 Material (MAT) System 144A-1, MAT-1, Secret Cipher of MAT Code, 1939年 144A-2, MAT-2, Secret Cipher of MAT Code, 1940年3月1日 - 1940年10月31日