| http://www.w3.org/ns/prov#value | - h means comprises a pair of contra-rotating brush rollers positioned side by side with axes parallel to one another and to the carpet surface and at right angles to the direction of movement of the cleaner, the arrangement being such that when the rollers rotate in use the dust, dirt, debris, litter and other particulate matter passes between the rollers generally upwardly from the carpet surface;
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