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<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://the-maintenance.com/Hitachi-Maintenance/Keyword/%D9%85%D8%B1%D9%83%D8%B2-%D8%B5%D9%8A%D8%A7%D9%86%D8%A9-%D9%87%D9%8A%D8%AA%D8%A7%D8%B4%D9%8A-%D8%A8%D8%A7%D9%84%D9%85%D9%86%D8%B5%D9%88%D8%B1%D8%A9>