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