4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
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Control system for a plurality of telephone sets

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

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Controlled power supply for key telephone system

Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent

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Controlling key-system groups from a distributed control switchi

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

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