flexible retractable roof
Retractable Roof
开合屋顶
开闭屋盖
活动屋盖
开合屋盖
可移动车顶
开启屋盖
Retractable Roof Structure
large-span roof structures
long-span canopy roof structures
Changing flat roof to slope roof
diagonal ridge for hip roof，vertical ridge for gable roof
flat- roof-to- slope-roof
flat-roof-to-slope-roof
flat-roof-to-sloping roof
roof pressure roof weight
roof prism (=roof-angle prism)
automatic retractable system
cup type retrievable packer
Deployable and Retractable Flexible Appendage