4. Telephonic communications
  5. With check operated control
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Face plate for coin operated telephone boxes

Telephonic communications – With check operated control
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Face plate with ad frames for coin operated telephone boxes

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

False call protecting apparatus for use with telephone exchange

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Fraud prevention in an electronic coin telephone set

Telephonic communications – With check operated control – At central office
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Fraud prevention in an electronic coin telephone set

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

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Fraud prevention system and method

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

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Full coin box signalling device for use with coin telephones

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

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