Nippon Seisen Co., Ltd., Suzuki Metal Industrial Co., Ltd., Sumitomo Electric Industries Ltd., Shiko Wire Company Ltd., Nippon Steel & Sumikin Welding Co., Ltd., Tokusen Co., Ltd., Nippon Koshuha Steel Co., Ltd., Torishima Pump Mfg. Co., Ltd., Caterpillar Inc., Sumitomo Metal Industries, Ltd., Nippon Piston Ring Co., Ltd., Mitsubishi Heavy Industries, Ltd.