Catherine H. O'Brien executrix

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Jersey City, NJ, US

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Patents Grantslast 30 patents

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
Information Patent Grant
Transmission of voice or sound through telegraphy
- Patent number 3,932,711
- Issue date Jan 13, 1976
- Gerard J. O'Brien
- G01 - MEASURING TESTING