Frequency response modifying appts. for telephone piezoelectric transducer - alters cross=sections of acoustic resonators and apertures for resonance in band between 1.9 and 3 kHz
HARDEBUSCH, ULRICH., 4290 BOCHOLT, DE, ANDERT, TOMAS JAN.., 4290 BOCHOLT, DE
Year of Publication 09.12.1993
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Year of Publication 09.12.1993
Patent
DE3825973
PIEPER, STEFAN, 4358 HALTERN, DE, ANDERT, TOMAS JAN, 4290 BOCHOLT, DE
Year of Publication 04.03.1993
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Year of Publication 04.03.1993
Patent
DE3617734
ANDERT, TOMAS JAN.., 4290 BOCHOLT, DE, PIEPER, STEFAN., 4358 HALTERN, DE
Year of Publication 12.11.1992
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Year of Publication 12.11.1992
Patent
ELEKTROAKUSTISCHER EINHEITSWANDLER
PIEPER, STEFAN, 4358 HALTERN, DE, ANDERT, TOMAS JAN, 4290 BOCHOLT, DE
Year of Publication 01.02.1990
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Year of Publication 01.02.1990
Patent