4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With intercom system
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Method and apparatus for designating and making an automatic cal

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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Method and apparatus for interfacing a drive-thru intercom...

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Reexamination Certificate

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Method and apparatus for recording or forwarding messages

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Reexamination Certificate

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Microprocessor controlled telephone unit

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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Multiplexed data channel controlled telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Patent

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