| http://www.w3.org/ns/prov#value | - Said blower means 4 are uniformly distributed over said wall 3 in the heightwise and widthwisedirections and are adapted to blow into said enclosure 2 a gaseous fluid, for example air, having a specified particle concentration, as shown by the arrows E; anda wall 5 of which opposite the wall 3 is provided with evacuation means 6 of a type known in itself, shown diagrammatically, also uniformly dis
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