| http://www.w3.org/ns/prov#value | - The fact that the filtration chamber in the device according to the invention, especially according to FIGS. 1 and 7, has the form of a thin channel containing a very small volume, sometimes in the order of 50 microliters, makes it possible to get an accurate reading of the remaining volume by putting indication markings on the sidewall of the channel or on the outside or inside of the sleeve.
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