Electroacoustic transducer of the so-called "electret" type, and a method of making such a transducer.

A.J. Sprenkels (Inventor), Piet Bergveld (Inventor)

Research output: Patent

Original languageUndefined
Patent number1e USA patentnr. 4,9
Priority date1/01/90
Publication statusIn preparation - 1 Jan 1990

Keywords

  • METIS-118277

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