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1 74HC51 2-wide 2-input, 2-wide 3-input AND-OR-INVERT Gate 47K HITACHI 4336559
2 74HC51 DUAL 2 WIDE 2 INPUT AND/OR INVERT GATE 64K ST 4336558
3 74HC51 DUAL 2 WIDE 2 INPUT AND/OR INVERT GATE 66K STMICROELECTRONICS 361959