How to escape open a hole on the door or floor if satisfied the auto closing function?
How to solve the oil leak problem of door closer /floor spring in past?
Is possible only a hinge can instead of traditional door closer and solve the above annoying problem?
With this goal , Yishida CEO Mr Wu who with 20years experience in the spring field start his develop from 2008-2011. A hydraulic with auto closing function creation at the end of 2011.
More than 95% of old customers have seen an increase 55% each year.