Keystone Alarm Services, Inc. Offers residential and commercial installation and monitoring of security and fire systems in Thomasville, PA including York and Adams Counties.in 1994 our founder, Kevin Meyers, was employed as an alarm technician by a major U.S. National alarm company. Believing that he could provide a superior level of installation, service and customer support, he decided to start his own business. Keystone Alarm was born, and six years later incorporated as Keystone Alarm Services Inc.
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