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