4. Telephonic communications
  5. Substation or terminal circuitry
  6. For loudspeaking terminal

Joseph A. Murphy

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Apparatus and method for reducing local interference in...

Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Reexamination Certificate

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Communications system and method for reducing the effects of...

Pulse or digital communications – Transceivers – Modems
Reexamination Certificate

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