| http://www.w3.org/ns/prov#value | - An enlargement of a portion of the protective facepiece or facemask 12 (FIGS. 1 and 2) is shown in FIG. 9, and it will be understood that the protective facepiece 12 may, as known to those skilled in the art, include an outer body 68 (shown in FIGS. 1 and 2 but not shown in FIG. 9) of flexible material, e.g. a suitable plastic or rubber, sometimes referred to as a flexible skirt, and a transparent
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