4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. With intercom system
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Telephone calling method and telephone apparatus

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

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Telephone intercom device

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

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Telephone local intercom system

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

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Telephone pager and intercom system

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

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Two-line apparatus for telephone intercom

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

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