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1 SN74LS221DRE4 DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS 636K TI 4145500
2 SN74LS221DRE4 DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS 780K TI 2024867
3 SN74LS221DRE4 DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS 633K TI 268670