Nippon Kogaku Kogyo, Oi Plant

Nippon Kogaku, Oi Plant

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

Nippon Kogaku Kogyo K.K

Nippon Kogaku Kogyo K.K

Nippon Kogaku Kogyo, Matsumoto

Nippon Tanatsu Kogyo Plant #5

Nippon Tanatsu Kogyo - Plant #5

Nippon Kagaku Kogyo K.K., 2nd Plant

Nippon Kogaku K.K., Shiojiri

Japan Optical, Nippon Kogaku

Nihon Kogaku, Suzugamori Plant

List of Authorized Use - Dai-Nippon Kikai Kogyo Aoto Plant

Nippon Kogyo Shimbun

List of Authorized Use - Nippon Kentetsu Kogyo Co., Ltd. Nakagawa Plant

Nippon Aluminum Kogyo K.K. (Mitsubishi Light Metal Mfg. Co.) - Mikuni Plant

Nippon Kogyo (File #177)

Nippon Suiso Kogyo K.K

Nippon Kentetsu Kogyo, Tokyo

Nippon Kentetsu Kogyo, Funabashi

Yamatake Kogyo, Omori Plant

Amatsuji Kogyo - Sennan Plant

Nippon Carbide Kogyo (File #201)

Shinsei Kogyo K.K. - Taniyama Plant

Chuo Kogyo K.K., Omori Plant