pipe frame keel 管肋龙骨

Pipe frame folding chair 折椅

steel pipe frame 钢管桁架

independent pipe frame 独立式管架

steel pipe frame column 钢管格构柱

fastener steel pipe frame 扣件钢管框架

steel-pipe frame structure 钢管框架结构

Model of drill pipe frame 钻架模型

fastener-style steel pipe frame 扣件钢管架