1946 : Initiation at Osaka Prefecture Sakai City Fukai Naka-machi.

          Unlimited partnership IZUMI KINZOKU KOUGYOUSYO is established.

1959 : IZUMI KINZOKU SEISAKUSYO CO.,LTD is established.

1960 : Trade name change of "Unlimited partnership IZUMI KINZOKU KOUGYOUSYO"

          to "Unlimited partnership NAKAO SEISAKUSYO"

          Trade name change of "IZUMI KINZOKU SEISAKUSYO CO.,LTD" to "IZUMI KINZOKU KOGYO CO.,LTD"

          KN-101,201,301 is developed.

1962 : New establishment of headquarters factory in Sakai City Fukai Naka-machi

1968 : KN-111,211,311 is developed.

1982 : moved to Tondabayashi City.

1985 : CNC type KN-112,212,312 is developed.

1989 : Super Finishing Machines, KN-500 series is developed.

1990 : CNC Small type KN-102,202,302 is developed.

1993 : Assembly machine KN-700 series is developed.

1996 : KN-421 Internal & External Grinding Machines is developed.

2000 : It is Absorption as for "Unlimited partnership NAKAO SEISAKUSYO".

          KN-314A CNC Tori port axis grinder is developed.

2006 : 3 Axis Grinding Machine KN-611 series is developed.