“FOR QUICK CLOSE FOR FIRE DAMPER
SHANGHAI HUASHENG TRANSMISSION TEC CO.,LTD” FUNNEL VENT.LOUVER OPERATING DEVICE SHANGHAI HUASHENG TRANSMISSION.NA.NA
“FOR QUICK CLOSE FOR FIRE DAMPER
SHANGHAI HUASHENG TRANSMISSION TEC CO.,LTD” AIR PIPE DIAMETRE 8MM
“FOR QUICK CLOSE FOR FIRE DAMPER
SHANGHAI HUASHENG TRANSMISSION TEC CO.,LTD” FUNNEL VENT.LOUVER OPERATING DEVICE SHANGHAI HUASHENG TRANSMISSION.NA.NA