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3566049
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3564540
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Patent number 3,564,540
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H03 - BASIC ELECTRONIC CIRCUITRY
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3560961
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Patent number 3,560,961
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H03 - BASIC ELECTRONIC CIRCUITRY
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3560963
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Patent number 3,560,963
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H03 - BASIC ELECTRONIC CIRCUITRY
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3553683
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H03 - BASIC ELECTRONIC CIRCUITRY
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3548397
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H03 - BASIC ELECTRONIC CIRCUITRY
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3540036
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H03 - BASIC ELECTRONIC CIRCUITRY
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3471850
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H03 - BASIC ELECTRONIC CIRCUITRY
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3461449
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G05 - CONTROLLING REGULATING
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3434136
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Patent number 3,434,136
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H03 - BASIC ELECTRONIC CIRCUITRY
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3423750
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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3383698
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3333068
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3274584
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3253260
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3249742
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3228021
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3189886
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G01 - MEASURING TESTING
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3127587
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2873441
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2766446
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2766445
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H03 - BASIC ELECTRONIC CIRCUITRY
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2752093
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2733430
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H03 - BASIC ELECTRONIC CIRCUITRY