4. Telephonic communications
  5. With check operated control
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Data communication circuit and method using telephone system

Telephonic communications – With check operated control – At terminal station
Patent

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Debit calling label

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

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Detection of telephone number spoofing

Telephonic communications – With check operated control – Fraud or interference prevention
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Dial assembly terminalgard

Telephonic communications – With check operated control – Fraud or interference prevention
Patent

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Directed call return service

Telephonic communications – With check operated control
Reexamination Certificate

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Dispenser with vandal resistant coin validator runway

Telephonic communications – With check operated control – Coin signalling or control
Patent

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Domestic origination to international termination country...

Telephonic communications – With check operated control – Fraud or interference prevention
Reexamination Certificate

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Dynamic escrow type detection system

Telephonic communications – With check operated control – Coin signalling or control
Patent

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Dynamic microphone handset and amplifier unit

Telephonic communications – With check operated control – At terminal station
Patent

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