| Jul.15,1963 | Koma Precision Co.,Ltd. established as subsidiary for Sayama Precision Co.,Ltd. |
| Mar,1980 | Chichibu Precision Co.,Ltd. established as subsidiary for Sayama Precision Co.,Ltd. |
| Oct,1996 | Sayama Precision - DC Motor Division, Koma Precision Co.,Ltd., and Chichibu Precision Co.,Ltd. gains ISO-9001 standards approval. |
| Aug,1999 | Koma Precision Co.,Ltd. consolidated with Chichibu Precision Co.,Ltd., and established Comatec Co.,Ltd. |
| Oct,2004 | ISO-14001 certifications. |
| Apr,2008 | Sayama Precision Co.,Ltd. changes to Citizen Sayama Co.,Ltd. |
| Oct,2009 | Accompanying the absorption merger of Citizen Saitama Co.,Ltd., company changes to Citizen Micro Co.,Ltd. |
| Oct,2013 | The DC Motor Division of Citizen Micro Co.,Ltd was split and absorbed by Comatec Co.,Ltd. which in turn changed the name to Citizen Micro Co.,Ltd. |
| Sep,2017 | New factory building launched at Hidaka Factory. |
| Oct,2018 | Head office transfer to the Hidaka City. |








