<https://secure.gravatar.com/avatar/53d47ce0c23b0c1a63b0293ef066e8e0?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.shannahancrane.com/7-interesting-facts-about-industrial-cranes>