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

David Farrell

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Programmable universal signaling circuit for a telephone network

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

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Surface-promoted cure of cationically curable compositions...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1775259

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