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Shenyang Metro
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2019/12/30
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2019
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12
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5
New progress in corporate qualification work
2019
-
12
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9
The company"s three system certification passed the annual supervision and examination
2019
-
12
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8
The company obtained two more utility model patents
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Market area
High-speed rail
Railway communication
Railway signal
Urban rail transit
Local railway line
Telecom operators
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