| http://www.w3.org/ns/prov#value | - The CAE unit 116 comprises, as illustrated purely schematically in FIG. 3, a gas-permeable, electrically conductive support layer 121 which can be designed, for example, as a mesh or net consisting of a metallic material, e.g. of nickel, through the openings in which a combustible gas can pass from a chamber 124 for combustible gas adjoining the support layer 121.
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