{HEAD ~ Sensors} of {TAIL ~ this sort} comprise structural elements inducing an oscillating flow component transverse to a fluid flow direction and representative of a rate of flow when the fluid is flowing along the flow direction 
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{ HEAD ~ Sensors } of { TAIL ~ this sort } comprise structural elements inducing an oscillating flow component transverse to a fluid flow direction and representative of a rate of flow when the fluid is flowing along the flow direction
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH