Salsbury Industries STD-4C 2BGlobal Florence Manufacturing Company Jensen Mailboxes Postal Products Unlimited Inc. Salsbury Industries Security Manufacturing STD-4B+ American Device Manufacturing (Company purchased by Florence Manufacturing; Horizontal units only) American Eagle Mailboxes Bommer Industries, Inc. Florence Manufacturing Company Jensen Mailboxes Salsbury Industries Security Manufacturing Controversy While centralized mail delivery is the preferred method of delivery by the United States Postal Service for new developments, some residents of these communities are opposed to centralized mail delivery. Those opposed are heavily in favor of conventional door to door delivery and/or do not like the idea of CBUs in their neighborhood. See also Post-office box References Postal systems