| http://www.w3.org/ns/prov#value | - With the foregoing objects in view, together with such other objects and advantages as may subsequently appear, the invention resides in the parts and in the combination, construction and arrangement of parts hereinafter described and claimed and illustrated by way of example in the accompanying drawing in which: Fig. 1 is a side elevation of the mask in its applied position; Fig. 2 is a front ele
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