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

Werner Dittmann

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Method and apparatus for the secured provision of functions...

Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Reexamination Certificate

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Method for automatic programming, and associated components

Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
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