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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3405313
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent number 3,319,111
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Issue date May 9, 1967
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H03 - BASIC ELECTRONIC CIRCUITRY
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3319112
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Patent number 3,319,112
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2992359
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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Patent number 2,905,856
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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H03 - BASIC ELECTRONIC CIRCUITRY
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2900565
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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2886741
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2872615
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H03 - BASIC ELECTRONIC CIRCUITRY
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2871405
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2870373
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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H03 - BASIC ELECTRONIC CIRCUITRY
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2869030
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Patent number 2,869,030
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2837692
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H04 - ELECTRIC COMMUNICATION TECHNIQUE