Two-way-connection One or more lamps are of 1 or 2 interface (s) on or off   Cross connection One or more lamps are of 3 or more positions on or off   Stairwell circuit One or more lamps are of X-as many positions on or off                           Control two-way-connection One or more lamps are of 2 positions on or off   Cheap two-way-connection One or more lamps are of 2 positions on or off   Fluorescent lamps Duo-circuit Indicative circuitry, Capacitive circuit   Electric contactor circuits Reversing starter circuit, star delta connection with self-attitude
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