{HEAD ~ a controlling device} mounted in {TAIL ~ said first body} and having at least first and second switches 
mounted in
{ HEAD ~ a controlling device } mounted in { TAIL ~ said first body } and having at least first and second switches
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH