SUPERVISORY SYSTEM FOR PUBLIC TELEPHONE SET

PURPOSE:To eliminate a private line and accessory devices for monitor by providing an exchange with a memory, where the number of cache pulses sent to a public telephone set is stored, and an input/output device to which the number of cache pulses outputted form the memory is inputted to output the...

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Bibliographic Details
Main Author NAITO KUNIO
Format Patent
LanguageEnglish
Published 03.03.1988
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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