{HEAD ~ A primary/secondary surge protector circuit} for protecting telecommunications equipment from power and surge transients includes a printed circuit board and {TAIL ~ a surge protector circuit} 
includes
{ HEAD ~ A primary / secondary surge protector circuit } for protecting telecommunications equipment from power and surge transients includes a printed circuit board and { TAIL ~ a surge protector circuit }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL