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Tri-S Security Corporation (Tri-S) is an aggregator of guard services, providing equipment and security services to various government agencies and private sector through its two direct, wholly owned subsidiaries, Paragon Systems and Cornwall. The
Alarms Unlimited is a Lincolnwood, IL-based company in the Business Services sector.
Hall Investigations is a Bel Air, MD-based company in the Business Services sector.
Doberman Security Products is a Tustin, CA-based company in the Business Services sector.
Main Street Records is a Easthampton, MA-based company in the Business Services sector.