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Person looking at lightbulb on paper sheet. Concept of invention patent protected industrial property or knowhow protection of inventor's intellectual work. Flat vector illustration for banner.
ID: 2082217414
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  • 矢量:可随意调整尺寸
  • 大图:2000 × 2000 像素·16.93 cm × 16.93 cm·300dpi·JPG