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1 M74HC21B1 DUAL 4-INPUT AND GATE 197K ST 5111746
2 M74HC21B1 DUAL 4-INPUT AND GATE 197K ST 4267139
3 M74HC21B1R DUAL 4-INPUT AND GATE 238K ST 4267138
4 M74HC21B1R DUAL 4-INPUT AND GATE 197K ST 4267137