| Principal Suppliers |
| | Gunei Chemical Industry Co., Ltd. |
| Japan Abrasive Grain Co., Ltd. |
| Meiwa Plastic Industries, Ltd. |
| Noritake Coated Abrasive Co., Ltd. |
| Saint-Gobain Ceramic Materials K.K. |
| Shinano Electric Refining Co., Ltd. |
| Principal Customers |
| | Bab-Hitachi Industrial Co. |
| Dainippon Ink and Chemicals, Incorporated |
| IHI Marine United Inc. |
| Japan Air Gases Ltd. |
| JFE Shoji Trade Corporation |
| Kawada Industries, Inc. |
| Kobe Steel, Ltd. |
| Kobelco Construction Machinery Co., Ltd. |
| Koganeshoji Co., Ltd. |
| Mitsubishi Heavy Industries, Ltd. |
| Naikaizosen |
| Nippon Steel Corporation |
| Okura Industrial Co., Ltd. |
| Osaka Fuji Corporation |
| Sankyu Inc. |
| Shikoku Welding Electrode Co., Ltd. |
| Sumitomo Metal Industries, Ltd. |
| Tadano Ltd. |
| The Japan Steel Works, Ltd. |
| Tohma g.m.s. |
| Tokyu Car Corporation |
| Toppan Printing Co., Ltd. |
| Toyo Ink Mfg. Co., Ltd. |
| Toyo Seikan Kaisha, Ltd. |
| TSUNEISHI SHIPBUILDING COMPANY |
