Frans Josef Maria Frankort

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Bocholtz, NL

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Patents Grantslast 30 patents

Information Patent Grant
Electroacoustic conversion device having a diaphragm comprising at...
- Patent number 4,028,566
- Issue date Jun 7, 1977
- U.S. Philips Corporation
- Nico Valentinus Franssen
- H04 - ELECTRIC COMMUNICATION TECHNIQUE