We have created a new type of door closer which has been patented by our nation. This item has made breakthrough in design. £¨1£© Very good performance of sealing and leakage proof, greatly avoid the disadvantage of oil leaking for common door closers. £¨2£© Automatically close doors without fixed speed, more humanoid design. £¨3£© Unique function in the world -- quickly close the door by hand, that is, when you need quickly close the door in emergency, you can do it by hand!
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