Coin operated telephone auditor

Coin relay drive and switching circuit for paystation telephone

Coin release mechanism of pay phone

Coin release mechanism of payphone

Coin return anti-stuffing apparatus and method

Coin return chute for telephone pay station

Coin return mechanism protecter

Coin slot structure for coin call telephone apparatus

Coin telephone box with anti-stuffing coin return chute

Coin telephone data port protection

Coin tone validator for telephone paystations

Coin validation method and apparatus for a coin telephone or sim

Coin-operated telephone apparatus

Coin-operated telephone apparatus

Combination pre-paid and calling card

Combination pre-paid and calling card

Communicating apparatus providing discriminated voice and/or ima

Communication apparatus utilizing digital optical signals

Computer-to-telephone interface

Country to domestic call intercept process (CIP)