SN74221N
Manufacturers：
Texas Instruments
Description：
IC DUAL MONOSTBL MULTIVIB 16-DIP
SN74221NE4
Manufacturers：
Texas Instruments
Description：
IC DUAL MONOSTBL MULTIVIB 16-DIP
SN7425N
Manufacturers：
Texas Instruments
Description：
IC GATE NOR 2CH 4-INP 14-DIP
SN7425NE4
Manufacturers：
Texas Instruments
Description：
IC GATE NOR 2CH 4-INP 14-DIP