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Separate symbols, four pins D Momentary Switch, single pole double throw, separate symbols | | | | R1, R10, R11 | 3 | 100R | Resistor | | | | | C7, C12, C13 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 main.

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