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1 SN74S257D QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS 676K TI 4247071
2 SN74S257D QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS 942K TI 2270784
3 SN74S257DE4 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS 676K TI 4247070
4 SN74S257DE4 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS 942K TI 3184594
5 SN74S257DG4 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS 942K TI 3184547