4. Telephonic communications
  5. Private or single line system
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Aircraft communications apparatus

Telephonic communications – Private or single line system – Doorbell system
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Arrangement for improving a telephone system

Telephonic communications – Private or single line system – Having telephone adaptor system
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Audio communication unit

Telephonic communications – Private or single line system – Two-way voice channel
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Audio distribution system

Telephonic communications – Private or single line system – With paging
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Automatic intercom system for buildings

Telephonic communications – Private or single line system – Doorbell system
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Automatic phone line re-allocation

Telephonic communications – Private or single line system – Lockout
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0
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