4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With exclusion or priority feature
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Telephone line lockout device

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

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Telephone privacy device with conference and indicator features

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

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Thermal management for a thin environmentally-sealed LCD...

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

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