Udo Petri

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Taunussein, DE

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Patents Grantslast 30 patents

Information Patent Grant
Voice controlled attenuation adjustment in telephone transmission c...
- Patent number 4,991,167
- Issue date Feb 5, 1991
- Telenorma Telefonbau und Normalzeit GmbH
- Udo Petri
- H04 - ELECTRIC COMMUNICATION TECHNIQUE