Nippon Kogaku K.K., Shiojiri

Nippon Kogaku Kogyo K.K

Nippon Kogaku Kogyo K.K

Nippon Kogaku, Oi Plant

Japan Optical, Nippon Kogaku

Nippon Kogaku Kogyo, Matsumoto

Nippon Kogaku Kogyo, Oi Plant

List of Authorized Use - Oi Plant, Nippon Kogaku Kogyo K.K. (Japan Optical Industry Co., Ltd.)

Nippon Zoki K.K

Nippon Hassoden K.K

Nippon Typewriter K.K

Nippon Hassonden K.K

Fushimi Factory (Osaka Military Arsenal), Dai Nippon Yoshi K.K., Dai Nippon Kogyo K.K., Dai Nippon Kikai Kogyo K.K

Tokai Ryuan K.K. (Former Nippon Hiryo K.K.)

Tokai Ryuan K.K. (Former Nippon Hiryo K.K.)

Nippon Suiso Kogyo K.K

Dai Nippon Shuppan K.K

Dai Nippon Koku K.K

Nippon Jidosha K.K. - Plant Accountability

Nippon Hassoden K.K. - Shikamako Plant

Nippon Nainenki K.K., Kamata Plant

Nippon Seitetsu K.K. (File #152)

Nippon Soda K.K. (File #153)

Nippon Denko K.K. (File #193)

Nippon Tungsten K.K. (File #232)