| http://www.w3.org/ns/prov#value | - Apparatus according to claim 1 or claim 2, in which the fluid is a liquid, and the means for passing fluid through the conduit in pulsatile flow comprises a unidirectional pump for providing mean flow and a pulsatile pump for superimposing reciprocatory pulsations on the mean flow, the pulsatile pump comprising mechanically linked and mechanically operated actuators which apply pressure alternatel
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