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MC74LS27DR2-MC74LS273DW-MC74LS26DR2-MC74LS266AN-MC74LS262DW
丝印MC74LS28N-MC74LS27N-MC74LS273-MC74LS262-MC74LS245
贴插MC74LS262-74HCT280D-701A22442-701A22532
贴片直插MC78M05CT MC74LS262 MC6026252 MC74HC20N 5