|1946||Foundation of the company at Nakamachi, Sakai City, Osaka Prefecture. Unlimited partnership "IZUMI KINZOKU KOGYOSYO" was established
where main business concerned manufacturing machineries for textile and agricultural industries.
|1952||Started manufacturing and processing of ball shafts.|
|1959||The name "IZUMI KINZOKU SEISAKUSYO CO. LTD.," was established. Business included manufacturing and processing of
various types of bearings, textile machine parts, and press processing.
|1960||Trade name of Unlimited partnership "IZUMI KINZOKU KOGYOSYO" changed to Unlimited partnership "NAKAO SEISAKUSYO "
Trade name of "IZUMI KINZOKU SEISAKUSYO CO. LTD.," changed to "IZUMI KINZOKU KOGYOU CO. LTD.,"
Business focused on manufacturing and repairing of various types of mashine tools.
The KN-101,201,and 301 grinding machines were developed.
|1962||Main factory was newly established at Fukai Naka-machi Sakai City.|
|1968||The KN-111,211,and 311 grinding machines were developed.|
|1982||Head office transferred to Tondabayashi City.|
|1985||The CNC type KN-113,213,and 312 grinding machines were developed.|
|1989||The KN-500 series Superfinishing machines for raceway bearings were developed.|
|1990||The CNC type KN-102,202, and 302 compact type grinding machines were developed.|
|1993||The KN-700 series for bearing assembly line was developed.|
|1996||The KN-421 CNC dual grinding machines was developed.|
|2000||"NAKAO SEISAKUSYO" was merged.
KN-314A CNC Toripod shaft grinding mchine was developed.
|2006||The KN-611 CNC 3-axis dual grinding machine was developed.|
|2013||Tetsuo Nakao was appointed Chairman of the Board, Tsutomu Nakao appointed President.|