| http://www.w3.org/ns/prov#value | - In this embodiment magnetic elements 9A, 9B and 9C have a cross-sectional profile which is substantially less than the cross-sectional profile of the inside of housing 1, so that the gas or other fluid may flow along the length of the housing 1, between the inner surface and magnetic elements 9A, 9B and 9C, the flow being shown by arrows 14.
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