Business scope: Install,
Air Defense Door,
Import And Export Of Goods And Technology,
Fire Proof Door,
Own House Rental,
Fire Window,
Civil Air Defense Engineering Supporting Equipment,
Mechanical And Electrical Equipment Installation,
Valve,
Subway Area Partition Door,
Subway Area Partition Door,
Ventilation Equipment,
Protective Airtight Doors For Subway And Tunnel Main Line,
Protective Airtight Doors For Subway And Tunnel Main Line,
Sale,