↩ 🔵 🔵 🔵 ❪✺_ₛₛ❫ Electrical Engineering Subsets ○ ❪◑❫ Circuits ○ ❪◑❫ Semiconductor Devices ○ Integrated Circuit (IC) ○꠹ ❪◑❫ 4000-Series Integrated Circuits ○