{TAIL ~ A hollow tube anode current collector} is sealed to {HEAD ~ a glass ring} which is sealed to a metal outer ring 
{ TAIL ~ A hollow tube anode current collector } is sealed to { HEAD ~ a glass ring } which is sealed to a metal outer ring
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH