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3739285
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3332021
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H03 - BASIC ELECTRONIC CIRCUITRY
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3314010
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H03 - BASIC ELECTRONIC CIRCUITRY
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3243710
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H03 - BASIC ELECTRONIC CIRCUITRY
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3225300
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G01 - MEASURING TESTING
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3181067
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H03 - BASIC ELECTRONIC CIRCUITRY
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2997580
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H03 - BASIC ELECTRONIC CIRCUITRY
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2995653
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H03 - BASIC ELECTRONIC CIRCUITRY
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2959673
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H03 - BASIC ELECTRONIC CIRCUITRY
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2942105
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Patent number 2,942,105
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H03 - BASIC ELECTRONIC CIRCUITRY
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2912571
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Patent number 2,912,571
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2894120
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Patent number 2,894,120
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2878377
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Patent number 2,878,377
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H03 - BASIC ELECTRONIC CIRCUITRY
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2859338
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H03 - BASIC ELECTRONIC CIRCUITRY
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2830177
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H03 - BASIC ELECTRONIC CIRCUITRY
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2809289
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H03 - BASIC ELECTRONIC CIRCUITRY
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2808507
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H03 - BASIC ELECTRONIC CIRCUITRY
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2800582
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H03 - BASIC ELECTRONIC CIRCUITRY
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2773182
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Patent number 2,773,182
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H03 - BASIC ELECTRONIC CIRCUITRY
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2770721
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H03 - BASIC ELECTRONIC CIRCUITRY
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2761964
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H03 - BASIC ELECTRONIC CIRCUITRY
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2743361
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H03 - BASIC ELECTRONIC CIRCUITRY
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2682606
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H03 - BASIC ELECTRONIC CIRCUITRY
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2679000
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H03 - BASIC ELECTRONIC CIRCUITRY
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2676247
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H03 - BASIC ELECTRONIC CIRCUITRY
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2652488
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H03 - BASIC ELECTRONIC CIRCUITRY
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2630527
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2624837
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H03 - BASIC ELECTRONIC CIRCUITRY
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2624827
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F24 - HEATING RANGES VENTILATING
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2617019
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H03 - BASIC ELECTRONIC CIRCUITRY