| http://www.w3.org/ns/prov#value | - The back-diffusion regulating outlet is made of an inert and biocampatible material selected from but not limited to metals including but not limited to titanium, stainless steel, platinum and their alloys and cobalt-chromium alloys and the like, and polymers including but not limited to polyethylene, polypropylene, polycarbonate and polymethylmethacrylate and the like.
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