{HEAD ~ The maneuverability} is achieved by {TAIL ~ a substantially disc} shaped inner part 3, which is displaceable in any direction in a cage formed by the guiding plate 4 a and the guiding baffle 4 b 
{ HEAD ~ The maneuverability } is achieved by { TAIL ~ a substantially disc } shaped inner part 3 , which is displaceable in any direction in a cage formed by the guiding plate 4 a and the guiding baffle 4 b
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH