| http://www.w3.org/ns/prov#value | - a body including a plenum, a first port through which gas with entrained particles can pass from a region outside of the body into the plenum, a second port and a third port, a preconcentrator fan adapted to draw gases through the plenum and second port, at least one pervious screen disposed across the second port, and a detector adapted to draw gases from the plenum through the third port and per
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