4. Telephonic communications
  5. With check operated control
  6. At terminal station
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Pay station telephone call routing apparatus

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

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Plug-in telephone facility

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

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Public communications services vending method and apparatus

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

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Public telephone volume control

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

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Public telephone with and method for cash payment function

Telephonic communications – With check operated control – At terminal station
Reexamination Certificate

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