4. Telephonic communications
  5. Multi-line or key substation system with selective switching...
  6. Detail of hold circuitry
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Telephone and telephone system having temporary transfer and hol

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent

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Telephone conversion device

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Patent

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Telephone main unit and telephone control apparatus

Telephonic communications – Multi-line or key substation system with selective switching... – Detail of hold circuitry
Reexamination Certificate

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