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1 M74HC257M1R HC258QUAD 2CHANNEL MULTIPLEXER 3-STATE, INVERTING HC257 QUAD 2 CHANNEL MULTIPLEXER 3-STATE 265K ST 4867381
2 M74HC257M1R QUAD 2 CHANNEL MULTIPLEXER (3-STATE) 202K ST 2177377
3 M74HC257M1R QUAD 2 CHANNEL MULTIPLEXER (3-STATE) 202K STMICROELECTRONICS 52584