Means for preventing infiltration of magnetic dirt particles into the air gap between poles of microphone magnetic structures

Bibliographische Detailangaben

1. Verfasser:	DUNCAN ROBERT K
Format:	Patent
Sprache:	eng
Schlagworte:	DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS
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