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1 SN74S20D DUAL 4-INPUT POSITIVE-NAND GATES 253K TI 4247099
2 SN74S20D DUAL 4-INPUT POSITIVE-NAND GATES 932K TI 2270845
3 SN74S20DE4 DUAL 4-INPUT POSITIVE-NAND GATES 932K TI 2270844
4 SN74S20DG4 DUAL 4-INPUT POSITIVE-NAND GATES 932K TI 2270842
5 SN74S20DR DUAL 4-INPUT POSITIVE-NAND GATES 932K TI 2270840