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BackThree position, single pole normally-open illuminated tactile switch SPST LED OFF-ON lamp D Single Pole Single Throw (SPST) switch D MEC 5G single pole double throw, separate symbols | | | | | U3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92"/>