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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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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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2549828
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2525491
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Patent number 2,525,491
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H03 - BASIC ELECTRONIC CIRCUITRY
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2523311
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H03 - BASIC ELECTRONIC CIRCUITRY
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2504469
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2491590
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H03 - BASIC ELECTRONIC CIRCUITRY
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2490428
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H03 - BASIC ELECTRONIC CIRCUITRY
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2472195
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H03 - BASIC ELECTRONIC CIRCUITRY
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2450445
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2447701
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H03 - BASIC ELECTRONIC CIRCUITRY
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2431333
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H03 - BASIC ELECTRONIC CIRCUITRY
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2429755
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2424089
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H03 - BASIC ELECTRONIC CIRCUITRY
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2393709
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H03 - BASIC ELECTRONIC CIRCUITRY
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2372701
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H03 - BASIC ELECTRONIC CIRCUITRY
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2348585
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H03 - BASIC ELECTRONIC CIRCUITRY
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2289243
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H03 - BASIC ELECTRONIC CIRCUITRY
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2247442
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2240580
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2233453
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2187782
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H03 - BASIC ELECTRONIC CIRCUITRY
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2185874
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...