Philippe P. Bertholon

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Boulogne-Billancourt, FR

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Patents Grantslast 30 patents

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Telephone transmission installation between interlocutors in a nois...
- Patent number 4,243,837
- Issue date Jan 6, 1981
- Electronique Marcel Dassault
- Philippe P. Bertholon
- H04 - ELECTRIC COMMUNICATION TECHNIQUE