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BackK temerature switch dual double-pole single-throw OFF-ON D Double Pole Single Throw (SPST) switch, small symbol D Push button switch, normally open, two pins, 45° tilted D Momentary Switch, single pole double throw D Switch, three position, single pole double throw | | | | | Q1, Q2, Q3 | 3 | A1M | **Potentiometer, 9 mm or 16 mm vertical board.