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3546630
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H03 - BASIC ELECTRONIC CIRCUITRY
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3546629
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H03 - BASIC ELECTRONIC CIRCUITRY
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3388286
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H03 - BASIC ELECTRONIC CIRCUITRY
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3370123
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3358183
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3287596
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H03 - BASIC ELECTRONIC CIRCUITRY
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2907919
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H03 - BASIC ELECTRONIC CIRCUITRY
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2854602
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H03 - BASIC ELECTRONIC CIRCUITRY
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2710353
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H03 - BASIC ELECTRONIC CIRCUITRY
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2633554
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2611089
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H03 - BASIC ELECTRONIC CIRCUITRY
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2591914
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H03 - BASIC ELECTRONIC CIRCUITRY
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2583012
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H03 - BASIC ELECTRONIC CIRCUITRY
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2562941
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H03 - BASIC ELECTRONIC CIRCUITRY
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2544213
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H03 - BASIC ELECTRONIC CIRCUITRY
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2540692
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H03 - BASIC ELECTRONIC CIRCUITRY
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2523108
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Patent number 2,523,108
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2521158
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H03 - BASIC ELECTRONIC CIRCUITRY
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2517715
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H03 - BASIC ELECTRONIC CIRCUITRY
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2512543
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E04 - BUILDING
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2501857
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Patent number 2,501,857
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H03 - BASIC ELECTRONIC CIRCUITRY
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2495696
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H03 - BASIC ELECTRONIC CIRCUITRY
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2493044
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H03 - BASIC ELECTRONIC CIRCUITRY
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2482150
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H03 - BASIC ELECTRONIC CIRCUITRY
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2440895
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H03 - BASIC ELECTRONIC CIRCUITRY
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2360697
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H03 - BASIC ELECTRONIC CIRCUITRY
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2320551
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H03 - BASIC ELECTRONIC CIRCUITRY
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2310888
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2308908
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H03 - BASIC ELECTRONIC CIRCUITRY
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2284337
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H04 - ELECTRIC COMMUNICATION TECHNIQUE