Full coin box signalling device for use with coin telephones
Inductive coin validation system and payphone using such system
Line card with distributed signaling voltages
Line powered pay telephone with power management
Low voltage operated coin relay
Monitoring system for remote devices
Pay phone
Pay phone deposit method for limiting overpayment by a customer
Pay station telephone coin box apparatus
Pay station telephone interface
Pay station telephone interface circuits
Telephone pay station and circuit therefor
Telephone-line powered coin telephone chassis
Tone Burst Generator