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3909567
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3865037
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F42 - AMMUNITION BLASTING
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3766408
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H03 - BASIC ELECTRONIC CIRCUITRY
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3696389
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3657557
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H03 - BASIC ELECTRONIC CIRCUITRY
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3654441
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H03 - BASIC ELECTRONIC CIRCUITRY
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3621280
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H03 - BASIC ELECTRONIC CIRCUITRY
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3567908
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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3500342
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3492659
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H03 - BASIC ELECTRONIC CIRCUITRY
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3457429
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Patent number 3,457,429
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H03 - BASIC ELECTRONIC CIRCUITRY
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3322974
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3226534
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