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3603978
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H03 - BASIC ELECTRONIC CIRCUITRY
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3579230
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G06 - COMPUTING CALCULATING COUNTING
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3577085
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Patent number 3,577,085
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G06 - COMPUTING CALCULATING COUNTING
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3553679
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Patent number 3,539,921
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Patent number 3,534,360
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H03 - BASIC ELECTRONIC CIRCUITRY
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3531799
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3518663
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Patent number 3,518,663
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3514774
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3510869
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3484776
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H03 - BASIC ELECTRONIC CIRCUITRY
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3471850
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3461347
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3324465
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H03 - BASIC ELECTRONIC CIRCUITRY