4. Telephonic communications
  5. With check operated control
  6. Fraud or interference prevention
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Theft proof pay phone

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

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Toll telephone system and method for maintaining or initiating l

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

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Two-part apparatus and method for protecting coin-operated telep

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

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Vandal-proof handset for a pay telephone

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

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Workstation for calling card fraud analysis

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

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