Sennheiser electronic GmbH & Co. KG is a private German audio company specializing in the design and production of a wide range of both consumer and high fidelity products, including microphones, headphones, telephony accessories, and avionics headsets for consumer, professional, and business applications.
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Sennheiser as reported by Wikipedia. Sennheiser electronic german private audio production company design product line, including headphones, aviation headphones.