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DISCO HOME > About DISCO > DISCO Corporate History

About DISCO



1937-1955 Beginnings

TOP 1956-1964
Company History Product History
Mitsuo Sekiya established Dai-Ichi Seitosho Company, Ltd. in Aga-machi, Kure City, Hiroshima Prefecture.
1937
Production and sales of vitrified grinding wheels begun.
Dai-Ichi Seitosho Co., Ltd. reorganized as a limited liability company; head office moved to the Kanda district of Tokyo.
1940
Inanemoto Seitosho Co., Ltd. of Shinagawa Ward, Tokyo, acquired to serve as Tokyo manufacturing facility; head office moved to this location.
1941
1942
Aga Plant partially rebuilt; production of resinoid cutting wheels begun.
Head office and Tokyo plant damaged in World War II bombing.
Plant temporarily closed at end of World War II.
Aga Plant in Kure City resumes production.
1945
Head office relocated to Shibatamachi in Minato Ward, Tokyo.
1950
Abrasive wheel developed to process key part of electricity meters; 100% market share attained.
Head office relocated to Shiba5-chome in Minato Ward, Tokyo.
1953
1955

Kure City, Hiroshima Prefecture, had long been known as a high-tech and ship-building center when, in 1937, DISCO Corporation was born there as Dai-Ichi Seitosho. The new company had plenty of ambition but not much production capacity. Finding it could not compete for military orders, Dai-Ichi moved its head office to the Kanda district of Tokyo while maintaining its production facility in Hiroshima. Thereafter, it would focus on building business in the civilian sector.

As Japan recovered from the war, Dai-Ichi received an interesting request from a manufacturer trying to build an electricity meter for use in individual homes. The proposed design included a round magnet that required a thin slit from the outside to the center (thereby making a "C" shape). The technology to make this slit, however, did not yet exist. Accepting this challenge with enthusiasm, Dai-Ichi was able to produce an abrasive wheel just 1.2 millimeters thick-at the time a revolutionary advance in abrasives technology. Both the meter and the abrasive wheel were a hit.

The success of this project made the future DISCO a player in Japan's burgeoning high-tech industry and a leader in precision abrasives. The switch of head office location to Tokyo and the concentration on civilian business had turned out to be very good-and lucky-moves indeed.

TOP 1956-1964

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