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3591841
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G01 - MEASURING TESTING
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3573755
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3567859
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3568182
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3531799
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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3466646
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Patent number 3,466,646
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3451053
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H03 - BASIC ELECTRONIC CIRCUITRY
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3434136
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3399401
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3380048
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3371335
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3358278
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3344418
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3290664
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3281825
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3275807
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3267264
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3241132
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3237012
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3217315
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3216004
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H03 - BASIC ELECTRONIC CIRCUITRY