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MC74LS247 MC74LS248 MC74LS249 MC74LS251原

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原MB74ALS1002 47393 MB74LS247 MC74HC74AN

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丝印MC74LS259N-MC74LS258J-MC74LS257B-MC74LS247D-MC74LS245N

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贴插74LS247-1A24VDC-IN4743A-MC14526-F01/BRR-BU4021B-N

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