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sentry (plural sentries) 1  A guard, particularly on duty at the entrance to a military base. ( 2 uncountable) Sentry duty; time spent being a sentry. ( 3 nautical) A form of drag to be towed underwater, which on striking bottom is upset and rises to the surface.
Sentry Products, A History. Sentry Products has been in the business of providing Duress Alarm Systems to correctional facilities, juvenile detention centers, judicial centers, emergency Medical facilities and schools for over 20 years. Our original system was developed by a grant from NASA for school security.