| http://www.w3.org/ns/prov#value | - When such gas leak detectors are installed at a site, such as an off-shore installation remote from a central alarm system, it is important continuously to ascertain that the detector is functioning reliably, i.e. that the absence of a signal from the detector indicating the presence of a gas leak is actually due to the fact that no such leak is present in the installation and is not caused by mal
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