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1 DM74LS191M Synchronous 4-Bit Up/Down Counters with Mode Control 178K NSC 5172130
2 DM74LS191M Synchronous 4-Bit Up/Down Counter with Mode Control 74K FAIRCHILD 4225212
3 DM74LS191M Synchronous 4-Bit Up/Down Counters with Mode Control 178K NSC 4225211
4 DM74LS191MX Synchronous Up/Down Counter 74K FAIRCHILD 3552672