electric drive means for driving, when said first switch of said controlling device is turned ON, said second body in one direction relative to said first body, and driving, when said {HEAD ~ second switch} of {TAIL ~ said controlling device} is turned ON, said second body in another direction relative to said first body 
electric drive means for driving , when said first switch of said controlling device is turned ON , said second body in one direction relative to said first body , and driving , when said { HEAD ~ second switch } of { TAIL ~ said controlling device } is turned ON , said second body in another direction relative to said first body
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