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https://www.amazon.com/Jefferson-International-Blackboard-Eraser-Classroom/dp/B00ZYDRZ9C
https://patents.google.com/patent/US7685672B2/en
https://patents.google.com/patent/US20060260092A1/en
https://www.youtube.com/watch?v=2MAa2_e6Z8Q
https://www.ebay.com/p/1139156792
https://www.ebay.com/itm/Jefferson-International-Blackboard-Eraser-Vacuum-Classroom-Office-New-In-Box-/203101119844
https://www.walmart.com/ip/Blackboard-Chalk-Eraser-School-Office-Vacuum-Classroom-Jefferson-International/163908529
https://www.pinterest.com/pin/238339005264857213/
https://www.ijser.org/researchpaper/DESIGN-AND-FABRICATION-OF-VACUUM-OPERATED-CHALK-DUST-COLLECTOR.pdf
https://www.sears.com/jefferson-international-blackboard-eraser-with-vacuum-classroom-office/p-SPM12805719619
https://timesofindia.indiatimes.com/city/bengaluru/class-7-students-smart-duster-can-vacuum-clean-blackboard/articleshow/67811717.cms
http://www.dusteze.com/en/product/main.php