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- In case of using general door - closers, it may be so hard to open door and there would be a distortion or slanting or slanting-down on it.
- This is because the turning center - line is not located in same position between door - axis and door - closer.
- From now, use the new door - closer of hinge type which is on the same center line by adopting the hinge inserted the door - closer.
- It is a new mechanism of world - first using Cam - Ball movement method that settle the problems ofgeneral door - closer.
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