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Musical keyboard
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Patent number 4,838,139
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Issue date Jun 13, 1989
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Sensor Technologies, Inc.
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David Fiori
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Inductance coil sensor
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Patent number 4,777,436
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Issue date Oct 11, 1988
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Sensor Technologies, Inc.
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David Fiori
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G01 - MEASURING TESTING
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Sensor apparatus
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Patent number 4,637,265
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Issue date Jan 20, 1987
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Sensor Technologies, Inc.
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David Fiori
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G01 - MEASURING TESTING