4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With special service
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Electronic gating control for manual telephone switchboard

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

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Exchange and conference communication method therefor

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

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