Various embodiments of {TAIL ~ the invention} provide an apparatus of the kind mentioned at {HEAD ~ the outset}, which presents a lowest possible total weight and a low energy demand 
Various embodiments of { TAIL ~ the invention } provide an apparatus of the kind mentioned at { HEAD ~ the outset } , which presents a lowest possible total weight and a low energy demand
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH