27 5140 - Door-Entry Intercom Systems

Aiphone Communication Systems
DKS DoorKing
Lee Dan Communications - Since 1955, standard and custom intercom entry, video intercoms, nurse-call and emergency call systems.
LiftMaster - Sentex
Mircom Technologies
Quantometrix
Tektone Sound and Signal Mfg. - UL-listed nurse call, wireless call, apartment entry, paging, rescue assistance systems, and alert notification.

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