The Spaces International Center Room 1702, Dongdaqiao Rd, Chaoyang District, Beijing, China,100020
In the early 1990s,verticality and linearity of elevator guide rail were tested by suspending steel wire rope while their installation inspection. But detection in -use was a difficult thing. The founders leaders company Liu Hongyun several optics experts decided to work on this problem unsolved worldwide for long.The ...
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