http://www.w3.org/ns/prov#value | - alves, pressure 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
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