1.　July 2006　　　 

U.S Leeman Technologies is founded 

2.　February 2007　

Start manufacturing hydraulic mechanism with nitrogen as energy storage in U.S

3.　March 2008　　

Leeman Hydraulic Technology Co., Ltd is  founded in Hong Kong 

4.　May 2010　　　

HDB-2/HDB-3/HDB-5 three prototypes of hydraulic operating mechanisms were 

successfully manufactured and officially put into production.

5.　August 2011　　

Prototypes of HDB-8 and HDB-11 hydraulic operating mechanism were completed, 

and passed class M2 mechanical endurance test of 10000 times..

6.　October 2011　

HDB series hydraulic operating mechanisms passed the authentication 

of the two Ministries

7.　August 2013　

Start R&D of engineering machinery multi-channel valve, high-speed railway 

oil pressure vibration damper