4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
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In-line telephone intercom system

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

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Information communication systems

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

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Information processing and communication apparatus

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

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Integrated telephone and intercom system

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

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Intercom system

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

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Intercom system for a service establishment

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

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Intercom telephone

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

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Intercommunication system for telephones

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

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ISDN dual bus extension phone system

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

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