Because of {HEAD ~ the simplicity} of {TAIL ~ the design} virtually any size round or rectangular or cylindrical cathode may be made, allowing designs for direct retrofitting of any existing cathode 
of
Because of { HEAD ~ the simplicity } of { TAIL ~ the design } virtually any size round or rectangular or cylindrical cathode may be made , allowing designs for direct retrofitting of any existing cathode
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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