The switching device assumes, when the first switch of the controlling device is turned ON, a first condition wherein the first and second output parts are charged positive and negative respectively, and assumes, when {HEAD ~ the second switch} of {TAIL ~ the controlling device} is turned ON, a second condition wherein the first and second output parts are charged negative and positive respectively 
The switching device assumes , when the first switch of the controlling device is turned ON , a first condition wherein the first and second output parts are charged positive and negative respectively , and assumes , when { HEAD ~ the second switch } of { TAIL ~ the controlling device } is turned ON , a second condition wherein the first and second output parts are charged negative and positive respectively
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