Sumitomo Electric Hardmetal Corp. Sumitomo Electric Industries, 프라그마틱 슬롯 사이트. 2003 Sumitomo Electric Industries, 프라그마틱 슬롯 사이트. Sumitomo Electric Hardmetal Corp.
- 1927
- Sumitomo Electric Wire & Cable Works (Sumitomo Electric Industries, 프라그마틱 슬롯 사이트.)
- 1929
- รูปเคบิลวดีเคร์วดสำหรับ
- 1931
- "Igetalloy"
- 1941
- Itami Igetalloy Works
- 1964
- Kyushu Seimitsu Kogyo Co., 프라그마틱 슬롯 사이트 (Kyushu Sumiden Seimitsu 프라그마틱 슬롯 사이트.)
- 1972
- Hokkaido Sumiden Precision Co., 프라그마틱 슬롯 사이트 (โรงานผลิตเมี่รงาก)
- 1977
- CBN "Sumiboron"
- 1978
- "Sumidia"
- 1981
- ต์คาร์ท่ิ้วดย่ช้วีการบัด
- 1984
- ก่อตั้ง Tokai Precision Co., 프라그마틱 슬롯 사이트 (ในปัจจุบันคือ Tokai Sumiden Precision Co., 프라그마틱 슬롯 사이트.)
- 1985
- "Sumicrystal"
- 1994
- English : 19805_19861
- 2003
- Sumitomo Electric Hardmetal Corp.