Nippon Kogaku, Oi Plant

Nippon Kogaku Kogyo, 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 K.K., Shiojiri

Japan Optical, Nippon Kogaku

Nippon Kogaku Kogyo, Matsumoto

Nihon Kogaku, Suzugamori Plant

Nippon Tokushuko, Omori Plant

Nippon Kinzoku, Matsuda Plant

Nippon Hassoden - Kizukawa Plant

Nippon Hassoden K.K., Ainoura Power Plant - Plant Accountability

Nippon Jidosha K.K. - Plant Accountability

Nippon Tanatsu Kogyo Plant #5

Nippon Hassoden K.K. - Shikamako Plant

Nippon Nainenki K.K., Kamata Plant

Nippon Tanatsu Kogyo - Plant #5

Nippon Kinzoku Sangyo, Machida Plant

Nippon Hassoden - Ainoura Power Plant

Nippon Kinzoku Sangyo, Tsudanuma Plant

Nippon Typewriter Co. - Mikuni Plant (Nakajima Kikai Osaka Plant)

Nippon Denki Yakin K.K. - Daimon Plant (Non-reparation Plant)

Nippon Gakki Seizo K.K., Tokyo Plant

Nippon Kagaku Kogyo K.K., 2nd Plant