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M74HC242B1R M74HC241M1R M74HC241B1R m74hc241b1r M74HC240TTR
丝印M74HC242BI M74HC242B1 M74HC241FP M74HC241B1 M74HC240BL
新M74HC242BI M74HC242B1 SLVU2.8-8G OQ8845T/K3 R
