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3868600
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3718872
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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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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3157848
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H03 - BASIC ELECTRONIC CIRCUITRY
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3105212
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H03 - BASIC ELECTRONIC CIRCUITRY
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3045220
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G11 - INFORMATION STORAGE
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3040184
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H03 - BASIC ELECTRONIC CIRCUITRY
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3004171
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2990521
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2980868
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H03 - BASIC ELECTRONIC CIRCUITRY
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2976478
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H03 - BASIC ELECTRONIC CIRCUITRY
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2967949
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H03 - BASIC ELECTRONIC CIRCUITRY
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2953739
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H03 - BASIC ELECTRONIC CIRCUITRY
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2934718
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H03 - BASIC ELECTRONIC CIRCUITRY
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2920264
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G05 - CONTROLLING REGULATING
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2920290
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Patent number 2,920,290
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H03 - BASIC ELECTRONIC CIRCUITRY
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2884599
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2876419
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2875412
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2870416
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H03 - BASIC ELECTRONIC CIRCUITRY