| http://www.w3.org/ns/prov#value | - For example, in one embodiment, the internal frame 26 is constructed from polyurethane having a durometer of 65 Shore D. In other embodiments, the internal frame 26 is constructed, in whole or in part, from other suitably rigid or semi-rigid materials, such as stainless steel, aluminum, magnesium, graphite, fiberglass, or other metals, alloys, or compositions that are sufficiently ductile and/or s
|
