Jerry O'Brien deceased

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LATE OF Jersey City, NJ, US

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Patents Grantslast 30 patents

Information Patent Grant
Mechanically-coupled microphone-speaker unit and intercom system
- Patent number 4,022,976
- Issue date May 10, 1977
- Jerry O'Brien
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Electro-mechanical amplifier sound transducer
- Patent number 3,970,804
- Issue date Jul 20, 1976
- Jerry O'Brien
- H04 - ELECTRIC COMMUNICATION TECHNIQUE