{TAIL ~ The filter} 11 is coaxially housed in an outer cylindrical casing 4 with a gap 14 provided within the casing and is retained by {HEAD ~ a pair} of front and rear shielding plates 17 and 18 
{ TAIL ~ The filter } 11 is coaxially housed in an outer cylindrical casing 4 with a gap 14 provided within the casing and is retained by { HEAD ~ a pair } of front and rear shielding plates 17 and 18
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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH