| http://www.w3.org/ns/prov#value | - found: Work cat.: Lightweight materials : understanding the basics, 2012: p. 1 (with the advent of the 20th century, improved lightweight materials such as aluminum, magnesium, beryllium, titanium, titanium aluminides, engineering plastics, structural ceramics, and composites with polymer, metal and ceramic matrices began to appear)
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