DM74LS26
Quad 2-Input NAND Gate (Fairchild Semiconductor)
DM74LS260
Dual 5-Input NOR Gate (National Semiconductor)
DM74LS265A
Hex TRI-STATE Buffers (National Semiconductor)
DM74LS266
QUAD 2-INPUT EXCLUSIVE-NOR GATE (National Semiconductor)
DM74LS20
Dual 4-Input NAND Gates (National Semiconductor)
DM74LS20
Dual 4-Input NAND Gate (Fairchild Semiconductor)
DM74LS21
Dual 4-Input AND Gates (National Semiconductor)
DM74LS22
Dual 4-Input NAND Gates (National Semiconductor)
DM74LS221
Dual Non-Retriggerable One-Shot (National Semiconductor)
DM74LS221
Dual Non-Retriggerable One-Shot (Fairchild Semiconductor)