4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Detail of hold circuitry

Thomas M. Lott

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Golfer's aid

Amusement devices: games – Surface projectile game; game element – Simulated game
Patent

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Hold and dial accessory for telephone instrument

Telephonic communications – Supervisory or control line signaling – Substation originated
Patent

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Loudspeaker telephone

Patent

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Method and apparatus for bandwidth reduction

Multiplex communications – Wide area network – Packet switching
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Multiple line self-contained telephone

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent

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Profile ID: LFUS-PAI-P-679707

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