Portable buildings of metal; Portable cabins of metal; Portable metal buildings; Portable outdoor security cabins of metal; Portable buildings made principally of metal; portable shelters of metal; portable metal buildings; portable outdoor security cabins of metal; metal enclosures for human habitation; radio frequency shielded metal enclosures for human habitation; shelters (building structures) of metal; acoustic panels of metal; acoustic enclosures of metal for human habitation