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3812481
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Patent number 3,812,481
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G01 - MEASURING TESTING
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G01 - MEASURING TESTING
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H03 - BASIC ELECTRONIC CIRCUITRY
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3577085
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3573805
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H03 - BASIC ELECTRONIC CIRCUITRY
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3509555
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H03 - BASIC ELECTRONIC CIRCUITRY
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3505670
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G06 - COMPUTING CALCULATING COUNTING
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G01 - MEASURING TESTING
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G01 - MEASURING TESTING
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3471852
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3465331
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3403392
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3310798
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3276010
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3268887
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3242478
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3234361
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3225344
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H03 - BASIC ELECTRONIC CIRCUITRY