| http://www.w3.org/ns/prov#value | - The nasal dilator, which is symmetrical, is made in one piece from a suitable resilient material, such as different types of plastic, e.g. polyethylene or polypropylene, and comprises a central, resilient, beam-shaped element which has a bending rigidity that is symmetrically increasing from the center towards the ends thereof, and two broad attaching ends or elements constituting essentially plan
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