Trunk preference circuit for a communication switching system
Trunk timer with exact time feature
Tsps-headphone plug messages
Two pair station protector
Two position mounting for telephone sets
Two way telephone communication system
Two wire voice and data subscriber loop
Two-handset cordless telephone system
Two-module telephone terminal and modules for this terminal
Two-party telephone system
Two-stage high-resolution digital-to-analog converter
Two-way communication helmet
Two-way communications earset with filter
Two-way loudspeaking device for telephone stations
Two-way voice communication device having external acoustic...
Two-way wireless cellular messaging system
Two-way wireless messaging system
Two-way wireless messaging system with flexible messaging
Two-way wireless messaging system with transaction server
Two-wire exchange telephone system