BS & B

[ metal punched angles, plates, panels, and gussets used in construction of platforms, walkways, racks and stairways; ] safety devices, namely, safety heads, rupture discs [, and explosion panels ] primarily made of metal, for sanitary and aseptic use in the construction, food [, chemical, paper, textile, petroleum refining, rubber, ] [ plastics, stone, ] [ clay, glass ] [, concrete, ] primary metal, [ fabricated metal, and engineering industries ] * industry *