a base mounted on a bottom of said housing and provided with {HEAD ~ a plurality} of {TAIL ~ tubular portions} thereon 
of
a base mounted on a bottom of said housing and provided with { HEAD ~ a plurality } of { TAIL ~ tubular portions } thereon
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH