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BackWith LCD screen K switch single-pole double-throw ON-OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D Push button switch, generic, symbol, four pins D Push button switch, normally open, two pins, 45° tilted D Momentary Switch, single pole double throw, separate symbols | | | | | S2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14