4. Telephonic communications
  5. With check operated control
  6. Other than coin

Tek Electronics Manufacturing Corporation

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Apparatus for optically coupling a terminal unit to the public t

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

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Battery and holder assembly for use with a battery operated touc

Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent

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Communication apparatus utilizing digital optical signals

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

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Pay type telephone station volume control push-button switch

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Patent

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Pay type telephone station volume control push-button switch

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Patent

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