Jacques Y. Balch

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Lannion, FR

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Patents Grantslast 30 patents

Information Patent Grant
Hands free telephone with switchable gain in the two speech signal...
- Patent number 4,454,384
- Issue date Jun 12, 1984
- Telecommunications Radioelectriques et Telephoniques T.R.T.
- Gilbert M. M. Ferrieu
- H04 - ELECTRIC COMMUNICATION TECHNIQUE