| http://www.w3.org/ns/prov#value | - A pair of spaced valves 92 and 94 are provided in the conduit 90 for controlling the flow of gas through the latter conduit, and a filter 94 is also connected in the conduit 90 between the latter valves for filtering foreign matter, such as dirt, iron filings, liquid, etc. from the gas as it passes through the conduit 90.
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