{HEAD ~ An ordered packing} for mass transfer and {TAIL ~ heat exchange processes} includes pre formed individual parts 
for
{ HEAD ~ An ordered packing } for mass transfer and { TAIL ~ heat exchange processes } includes pre formed individual parts
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH