4. Telephonic communications
  5. Plural exchange network or interconnection
  6. Interexchange signalling

Ewald Dotzauer

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Circuit arrangement for a small PABX with a switching matrix tha

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent

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Circuit arrangement for an interference data alarm system in com

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent

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