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PWM modulator
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Patent number 10,581,422
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Issue date Mar 3, 2020
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Kabushiki Kaisha Toshiba
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Akira Yamauchi
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Vacuum tube audio amplifier
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Patent number 10,218,320
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Issue date Feb 26, 2019
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ECHOWELL ELECTRONICS CO., LTD.
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Hsi-Hsien Chen
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Condenser microphone
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Patent number 9,736,586
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Issue date Aug 15, 2017
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Kabushiki Kaisha Audio-Technica
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Hiroshi Akino
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H03 - BASIC ELECTRONIC CIRCUITRY
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Vacuum tube circuit
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Patent number 7,397,303
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Issue date Jul 8, 2008
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KORG, Inc.
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Fumio Mieda
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H03 - BASIC ELECTRONIC CIRCUITRY
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3743954
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Issue date Jul 3, 1973
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H03 - BASIC ELECTRONIC CIRCUITRY
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3262067
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Patent number 3,262,067
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Issue date Jul 19, 1966
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H03 - BASIC ELECTRONIC CIRCUITRY
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3258710
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Patent number 3,258,710
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Issue date Jun 28, 1966
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H03 - BASIC ELECTRONIC CIRCUITRY
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3116455
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Issue date Dec 31, 1963
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H03 - BASIC ELECTRONIC CIRCUITRY
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3066264
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Patent number 3,066,264
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Issue date Nov 27, 1962
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H03 - BASIC ELECTRONIC CIRCUITRY
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3009112
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Patent number 3,009,112
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H03 - BASIC ELECTRONIC CIRCUITRY
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2991423
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Patent number 2,991,423
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Issue date Jul 4, 1961
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H03 - BASIC ELECTRONIC CIRCUITRY
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2984792
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Patent number 2,984,792
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Issue date May 16, 1961
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H03 - BASIC ELECTRONIC CIRCUITRY
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2969506
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Patent number 2,969,506
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Issue date Jan 24, 1961
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H03 - BASIC ELECTRONIC CIRCUITRY
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2936420
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Patent number 2,936,420
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Issue date May 10, 1960
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2912571
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Patent number 2,912,571
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Issue date Nov 10, 1959
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2870269
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Patent number 2,870,269
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Issue date Jan 20, 1959
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H03 - BASIC ELECTRONIC CIRCUITRY
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2808470
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Patent number 2,808,470
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Issue date Oct 1, 1957
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H03 - BASIC ELECTRONIC CIRCUITRY