H03G 3/22

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9544043 Electronic circuit arrangement for receiving low frequency electro-magnetic waves with an adjustable attenuator elementSep 08, 15Jan 10, 17MAXIM INTEGRATED PRODUCTS GMBH
9130528 Electronic circuit arrangement for receiving low frequency electromagnetic waves with an adjustable attenuator elementJul 28, 14Sep 08, 15MAXIM INTEGRATED PRODUCTS, INC.
8964998 System for dynamic spectral correction of audio signals to compensate for ambient noise in the listener's environmentJun 07, 12Feb 24, 15Sound Enhancement Technology, LLC
4644289 Variable power amplifier for audio frequency signals and methodDec 03, 84Feb 17, 87Carter Duncan Corp.