{HEAD ~ A fan}, having {TAIL ~ blades} adapted to operate in at least two positions comprising, 
{ HEAD ~ A fan } , having { TAIL ~ blades } adapted to operate in at least two positions comprising ,
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH