<http://schema.org/keywords>
"drill, screw, threads, tempering, bohren, Gewinde, Anlassen, de forage, filetage, la trempe, broca, roscas, t\u00EAmpera"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.bibliocad.com/library/allen-bolts_41486>