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Rotating speaker array
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Murray R. Clark
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Apparatus for processing tone signals
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WERSI-electronic GmbH & Co. Kommanditgesellschaft fur elektronische Bauelemente
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Tone signal modulation system
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D. H. Baldwin Company
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3886835
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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G10 - MUSICAL INSTRUMENTS ACOUSTICS