{HEAD ~ a single, hermetically sealed housing} including {TAIL ~ a metal base plate} and a housing cover, or cap sealed thereto 
including
{ HEAD ~ a single , hermetically sealed housing } including { TAIL ~ a metal base plate } and a housing cover , or cap sealed thereto
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH