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3042879
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3009116
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2922120
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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2762920
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H03 - BASIC ELECTRONIC CIRCUITRY
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2755382
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H03 - BASIC ELECTRONIC CIRCUITRY
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2748282
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H03 - BASIC ELECTRONIC CIRCUITRY
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2736806
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H03 - BASIC ELECTRONIC CIRCUITRY
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2735010
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2712606
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H03 - BASIC ELECTRONIC CIRCUITRY
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2638549
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2624007
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Patent number 2,624,007
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H03 - BASIC ELECTRONIC CIRCUITRY
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2623178
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2620443
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2616048
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2611872
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H03 - BASIC ELECTRONIC CIRCUITRY
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2609507
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H03 - BASIC ELECTRONIC CIRCUITRY
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2605407
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H03 - BASIC ELECTRONIC CIRCUITRY
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2605424
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2605423
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2588098
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2578273
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H03 - BASIC ELECTRONIC CIRCUITRY
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2573284
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H03 - BASIC ELECTRONIC CIRCUITRY
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2562925
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H03 - BASIC ELECTRONIC CIRCUITRY
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2556027
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H03 - BASIC ELECTRONIC CIRCUITRY
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2538261
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H04 - ELECTRIC COMMUNICATION TECHNIQUE