A dual-purpose file folder

• 1. 两用文件夹 [P] . 中国专利： CN208306204U . 2019.01.01
• 2. 两用文件夹 [P] . 中国专利： CN204774179U . 2015.11.18
• 3. Dual-purpose file folder convertible into a folder and a tray [P] . 英国专利： GB2479395A . 2011-10-12

  机译： 可转换为文件夹和托盘的两用文件夹

• 4. Retractable dual-purpose file folder [P] . 美国专利： US8038052B2 . 2011-10-18

  机译： 伸缩式两用文件夹

• 5. RETRACTABLE DUAL-PURPOSE FILE FOLDER [P] . 美国专利： US2011031732A1 . 2011-02-10

  机译： 可伸缩双用途文件文件夹

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