Tamper-deterrent device
Tamperproof pay telephone
Telecommunication-time metering device utilizable for prepayment
Telecommunications device with simplified calling procedures
Telecommunications fraud prevention system and method
Telecommunications system, service control point and method...
Telephone anti-theft device
Telephone apparatus with a fixed telephone station coupled to a
Telephone body guard armor
Telephone calling card service system integrating virtual...
Telephone calling card system with abbreviated code...
Telephone calling card with enhanced features
Telephone calling with automatic billing
Telephone card having calendar function and system for using sam
Telephone pay station
Telephone pay station and circuit therefor
Telephone relay cover
Telephone set
Telephone set
Telephone system