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3573471
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H03 - BASIC ELECTRONIC CIRCUITRY
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3543150
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G01 - MEASURING TESTING
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3508808
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3505530
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3462758
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Patent number 3,462,758
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H03 - BASIC ELECTRONIC CIRCUITRY
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3426340
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G01 - MEASURING TESTING
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3390315
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3359499
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H03 - BASIC ELECTRONIC CIRCUITRY
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3359368
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Patent number 3,359,368
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3344418
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3327301
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Patent number 3,327,301
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H03 - BASIC ELECTRONIC CIRCUITRY
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3307172
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3307105
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Patent number 3,307,105
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H03 - BASIC ELECTRONIC CIRCUITRY
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3303694
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3286232
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H03 - BASIC ELECTRONIC CIRCUITRY
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3283319
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3273013
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3271758
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3264574
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3264409
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3258764
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3258667
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3249742
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3239831
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3232596
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3230358
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3226710
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3216002
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H03 - BASIC ELECTRONIC CIRCUITRY