74F51 Dual 2-wide 2-input, 2-wise 3-input AND-OR-invert gate
74F512 From datasheet system
74F51PC Dual 2-Wide 2-Input; 2-Wide 3-Input AND-OR-Invert Gate
74F51SC Dual 2-Wide 2-Input; 2-Wide 3-Input AND-OR-Invert Gate
74F51SCX 2/2-input and 3/3-input AND-NOR Gate
74F51SJ Dual 2-Wide 2-Input; 2-Wide 3-Input AND-OR-Invert Gate
74F51SJX 2/2-input and 3/3-input AND-NOR Gate