Telephone system
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United States of America Patent
Stats
-
Nov 10, 1987
Grant Date -
N/A
app pub date -
Nov 13, 1985
filing date -
Nov 13, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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