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BackComponents SPST SMD PTS645 Series 6mm Tact Switch Low-profile SMD Tactile Switch, B3SL Middle Stroke Tactile Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, without Boss Ultra-small-sized Tactile Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, with Boss SPST button switch | | R30 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14"/>