<https://secure.gravatar.com/avatar/682217c9730705ecb48cc7bd313474f9?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://viamvina.com.vn/pro/protek-506-digital-mulimeter-2-2/>