{HEAD ~ a multiplicity} of {TAIL ~ bladed interrupter elements} disposed longitudinally relative to one another in the direction of flow of the fluid, 
{ HEAD ~ a multiplicity } of { TAIL ~ bladed interrupter elements } disposed longitudinally relative to one another in the direction of flow of the fluid ,
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH