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                             NCC-CE certificate
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                             Wind turbine variable pitch system certification
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                             Patent for Large Electrical Installation Board Assembly Cart
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                             Hunan University Doctoral Research Base
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                             ISO Quality Management System Certification
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                             Wind turbine master control system authentication and certification
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                             Patent for pitch control system and propeller retraction device for communication
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                             Patent for Lead Acid Battery Charging Management System
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                             PCS-CE certificate