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H03 - BASIC ELECTRONIC CIRCUITRY
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2463710
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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Patent number 2,418,116
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2405519
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H03 - BASIC ELECTRONIC CIRCUITRY
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2395744
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2391967
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G06 - COMPUTING CALCULATING COUNTING
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2368328
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H03 - BASIC ELECTRONIC CIRCUITRY
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2358901
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H03 - BASIC ELECTRONIC CIRCUITRY
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2358902
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H03 - BASIC ELECTRONIC CIRCUITRY
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2357922
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H03 - BASIC ELECTRONIC CIRCUITRY
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2340742
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2331723
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H03 - BASIC ELECTRONIC CIRCUITRY
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2320756
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H03 - BASIC ELECTRONIC CIRCUITRY
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2257795
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2250529
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H03 - BASIC ELECTRONIC CIRCUITRY