4. Telephonic communications
  5. With check operated control
  6. Other than coin
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Administrative monitoring system for calling card fraud preventi

Telephonic communications – With check operated control – Other than coin
Patent

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Apparatus for facilitating the making of a calling card telephon

Telephonic communications – With check operated control – Other than coin
Patent

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Apparatus for optically coupling a terminal unit to the public t

Telephonic communications – With check operated control – Other than coin
Patent

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Apparatus for querying a central service

Telephonic communications – With check operated control – Other than coin
Reexamination Certificate

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Applications platform for a telephone system gateway interface

Telephonic communications – With check operated control – Other than coin
Patent

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ATM phone card system

Telephonic communications – With check operated control – Other than coin
Reexamination Certificate

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ATM phone card system

Telephonic communications – With check operated control – Other than coin
Patent

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