Containers 11 and 12 may be {HEAD ~ a common unit} separated by {TAIL ~ a liquid tight partition} 16 and provided with a hinged cover 17 
separated by
Containers 11 and 12 may be { HEAD ~ a common unit } separated by { TAIL ~ a liquid tight partition } 16 and provided with a hinged cover 17
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH