04706275 is referenced by 384 patents and cites 6 patents.

A telephone system enabling prepayment for telephone calls, wherein special code and credit information is stored in memory in special exchanges and debited as the call progresses.

Title
Telephone system
Application Number
6/797658
Publication Number
4706275
Application Date
November 13, 1985
Publication Date
November 10, 1987
Inventor
Zvi Kamil
Ramat Gan
IL
Agent
Sandler & Greenblum
Assignee
Aerotel
IL, US
IPC
H04M
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