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Back4 Knobs Screws, nuts, and spacers (see [build notes](build.md | | R4, R6, R7, R30, R31 Switch, dual pole double throw Precision Timers, 555 compatible, PDIP-8"/>
4 Knobs Screws, nuts, and spacers (see [build notes](build.md | | R4, R6, R7, R30, R31 Switch, dual pole double throw Precision Timers, 555 compatible, PDIP-8"/>