6 Metal grain storage bins and non-mechanical hopper tanks; metal bin parts, namely, bin roof and sidewall access doors, bin roof vents, bin floors, bin floor supports, bin wall panels, bin roof stairs, bin sidewall ladders, bin ladder safety cages, bin roof safety rings, bin air inlets, bin roof fill opening peak caps, bin view windows; non-mechanical metal hopper tank parts, namely, hopper roofs and bottoms, hopper discharge collars, hopper legs, hopper anchors; ducts for drying and aerating grain; all the aforementioned goods made principally of metal; parts and fitting for the aforesaid goods; Metal silos; Hoppers of metal, non-mechanical; metal containers for storage; metal doors; Prefabricated metal walls; Ducts of metal for ventilating installations; Ventilating ducts of metal; Ladders of metal; Prefabricated metal platforms; Metal stairs; handrails of metal for stairs; Ducting conduits, non-electrical, of metal; Grates made of metal; Walkways of metal; Metal structures, namely, scaffolding towers