| http://www.w3.org/ns/prov#value | - e relief valves, compressors, open-ended lines, flanges, connectors, and other equipment covered by the applicable subpart that require monitoring with a 40 CFR part 60, appendix A-7, Method 21 monitor.(3) Imaging means making visible emissions that may otherwise be invisible to the naked eye.(4) Optical gas imaging instrument means an instrument that makes visible emissions that may otherwise be
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