<https://secure.gravatar.com/avatar/a0f7c7feb3ca7ea2f1f63fa22bae3bd9?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://obrabiarki-cnc.pl/en/15th-anniversary-of-the-metalworking-cluster/>