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08/2015
Patent
09/2019
A condenser microphone, including at least one diaphragm, at least one electrode assigned to the diaphragm, comprising at least one ring-shaped insulator... 
ELECTRIC COMMUNICATION TECHNIQUE | PUBLIC ADDRESS SYSTEMS | LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS | ELECTRICITY | DEAF-AID SETS
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