| http://www.w3.org/ns/prov#value | - For example, in an embodiment of an access port including titanium, if the overall thickness of the cavity base 220 is approximately 0.020??? then sufficient contrast for x-ray imaging purposes can be obtained in one embodiment by engraving the identification feature 200 to a depth X (FIGS. 56A, 56B) of between about 0.009??? and about 0.011???.
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