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

John N. Martin

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Autocorrelating 2400 bps handshake sequence detector

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

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High speed half duplex modem with fast turnaround protocol

Pulse or digital communications – Spread spectrum – Direct sequence
Patent

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Security system

Telecommunications – Radiotelephone system – Emergency or alarm communication
Reexamination Certificate

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Profile ID: LFUS-PAI-P-596180

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