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

James R Davis

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Spool assembly

Inductor devices – Coil or coil turn supports or spacers – Coil on a preformed support or mount
Reexamination Certificate

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Telephone circuit controller apparatus

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

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Profile ID: LFUS-PAI-P-2889180

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