Building materials made principally of common metal; articles of metal or predominantly of metal for use in construction; panels of metal; panels with a metal exterior and an interior consisting of insulating material; insulated roofing panels in this class; insulated building panels in this class; goods being a combination of any of the aforesaid sold in kit form intended for assembly into complete structures; metal doors; doors with a metal exterior and an interior consisting of insulating materials parts, fittings and accessories for the aforesaid goods