| http://www.w3.org/ns/prov#value | - These materials include, but are not limited to (i) elastic members overlaid by a material suitable for forming a substantially gas-tight seal between the mask and the wearer's face, (ii) thin strips of bendable or deformable material, such as aluminum or thin gauge steel overlaid by a material suitable for forming a substantially gas-tight seal between the mask and the wearer's face, or (iii) com
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