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

Minh Hoang

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Apparatus and method for interfacing between a communications ch

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 interfacing between a communications ch

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

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Coin tone validator for telephone paystations

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

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DMA controller

Electrical computers and digital data processing systems: input/ – Input/output data processing – Direct memory accessing
Reexamination Certificate

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High speed dial-up service using PCM modem technology

Pulse or digital communications – Transceivers – Modems
Reexamination Certificate

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Profile ID: LFUS-PAI-P-100862

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