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3768022
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H03 - BASIC ELECTRONIC CIRCUITRY
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3634838
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G08 - SIGNALLING
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3588462
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G08 - SIGNALLING
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3543150
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Patent number 3,543,150
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3541546
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H03 - BASIC ELECTRONIC CIRCUITRY
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3536995
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G01 - MEASURING TESTING
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3537099
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3534360
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3509559
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3480947
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3469257
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3440410
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3345629
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3328568
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3323053
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3319243
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3312903
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3295061
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