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3843872
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G06 - COMPUTING CALCULATING COUNTING
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G06 - COMPUTING CALCULATING COUNTING
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3750142
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H03 - BASIC ELECTRONIC CIRCUITRY
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3743429
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G01 - MEASURING TESTING
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H03 - BASIC ELECTRONIC CIRCUITRY
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3725905
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3665305
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Patent number 3,665,305
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H03 - BASIC ELECTRONIC CIRCUITRY
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3618075
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G06 - COMPUTING CALCULATING COUNTING
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3612975
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G06 - COMPUTING CALCULATING COUNTING
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3603970
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Patent number 3,603,970
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H03 - BASIC ELECTRONIC CIRCUITRY
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3594765
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3593007
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H03 - BASIC ELECTRONIC CIRCUITRY
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3582940
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H03 - BASIC ELECTRONIC CIRCUITRY
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3581304
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H03 - BASIC ELECTRONIC CIRCUITRY
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3571510
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G06 - COMPUTING CALCULATING COUNTING
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3569952
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3566396
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H03 - BASIC ELECTRONIC CIRCUITRY
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3564406
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G01 - MEASURING TESTING
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3519807
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3506818
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3479496
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