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Basic profile of aluminum sliding door closer body:Modern hydraulic door closer (the closers) began in the early twentieth CenturyAmerican patent registration, which is different from the traditional closed door, is to achieve the buffer by throttling the door closers in liquid. The core of hydraulic door closer design idea is to control the closing process, the function of closing process can be adjusted according to the needs of people. They have many uses, including the main purpose is to enable the door to be automatically closed, to limit the spread of fire and building ventilation.
