DS CWA 15902-2:2009 Lifting And Load-Bearing Equipment For Stages And Other Production Areas Within The Entertainment Industry - Part 2: Specifications For Design, Manufacture And For Use Of Aluminium And Steel Trusses And Towers Provides design, manufacture and use of aluminium and steel trusses, towers and associated structural components such as tower head blocks, sleeve blocks, bases and corner blocks used in the entertain