6
Shelters [building structures] of metal; Metal storm shelters; Buildings, transportable, of metal; Underground tornado shelters made of metal; Structures and transportable buildings of metal; Metallic capsules [containers]; Prefabricated metal buildings; Modular metallic structures; Metal framed buildings; Frames of metal for building; Building and construction materials and elements of metal; Metal storage shelters; Airlock chambers of metal; Safety doors of metal; Ready made building components [metal]
19
Shelters (Non-metallic -); Structures and transportable buildings, not of metal; Non-metal storm shelters; Underground tornado shelters made of fiberglass; Buildings, transportable, not of metal; Modular shelters (Non-metallic -); Portable buildings (Non-metallic -) incorporating kitchen facilities; Portable buildings (Non-metallic -) incorporating toilet facilities; Buildings, not of metal; Concrete building elements; Prefabricated building components (Non-metallic -); Prefabricated building elements (Non-metallic -) for on site assembly; Structures made of non-metallic materials; Modular building units (Non-metallic -); Manholes (Non-metallic -); Building and construction materials and elements, not of metal