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Patents Grantslast 30 patents

Information Patent Grant
Connecting device for telecommunication circuits
- Patent number 4,017,770
- Issue date Apr 12, 1977
- Applicazione Elettrotelefoniche SpA
- Cesare Valfre
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Connecting device for telecommunication circuits, particularly for...
- Patent number 4,017,768
- Issue date Apr 12, 1977
- Cesare Valfre
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Negative impedance repeater with double amplification, for telephon...
- Patent number 3,974,345
- Issue date Aug 10, 1976
- Cesare Valfre
- H04 - ELECTRIC COMMUNICATION TECHNIQUE