4. Telephonic communications
  5. Telephone line or system combined with diverse electrical...
  6. Having transmission of a digital message signal over a...

Intertex Data AB

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Apparatus and method for determining the state of a telephone li

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent

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Apparatus and method for determining the state of a telephone li

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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PCMCIA smart card reader

Registers – Coded record sensors – Holding devices
Reexamination Certificate

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