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R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7, R30, R31 Switch, dual pole double throw, separate symbols K switch dual double-pole single-throw OFF-ON D Single Pole Single Throw (SPST) switch, small symbol D 9x DIP Switch, Single Pole Single Throw (SPST) switch, small symbol.

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