Toyo Keidai Kokan Seizosho, Kubota Iron & Machinery Works - Fuse Plant, Kurimoto Iron Works - Fukae Plant, Condor Sewing Machine Co

Kubota Iron & Machinery Works Ltd. - Sakai Plant

Kubota Iron & Machinery Works Ltd. - Chuko Plant and Okajima Plant

Foundry Research Laboratory - Kubota Iron & Machinery Works Co. Ltd

Daini Kubota Iron & Machinery Works, Ltd. - Marine Engine Shop

Kurimoto Iron Works - Sumiyoshi Plant

Kuwahata Electric Engineering Works, Kyokuto Seisakusho, Kusuda Chukosho, Kurimoto Iron Works - Kagaya Plant

Hirose Iron Works, Hirano Bearing Mfg. Co., Minato Electric Co., Daido Kogyo Co. - Mikuni Plant

Iwazumi Iron Works, Izumi Paper Manufacturing Co., Ltd. Kawasaki Heavy Ind. K.K. Fukai Plant, Kawasaki Works Ltd

Mitsubishi Denki K.K. - Wakayama Kojo, Misugi Iron Works, Kano Manufactory, Matsushita Electric Ind. Co. - Juso Plant