4. Telephonic communications
  5. With check operated control
  6. Fraud or interference prevention
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Answer detection method and apparatus for coin telephone sets

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

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Anti-explosive return coin discharge unit for the cabinet of a c

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

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Anti-fraud device for use with a coin operated telephone instrum

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

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Anti-stuffing coin return assembly

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

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Anti-stuffing lead-in-chute on coin acceptor for payphone

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

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Apparatus and method for securing an armored cord and restraint

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

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