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Electric spoon
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Patent number 8,237,037
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Issue date Aug 7, 2012
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Larry L. Plummer
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Fiber optic musical instruments
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Patent number 4,442,750
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Issue date Apr 17, 1984
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Optical Technologies, Inc.
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George A. Bowley
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Issue date Aug 11, 1970
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G10 - MUSICAL INSTRUMENTS ACOUSTICS