Original document(4 pages)  中文版
    The invented automatic blackboard eraser is made up by fixing a strip-type eraser to the ends of two parallel rods of extension umbrella and fixing the another ends to an iron pipe. If the buttons on the rods of extension umbrella are pressed, the eraser can erase the blackboard from near to far with the extension of umbrella rods.
Application Number
申请号		 91111895 Application Date
申请日		 1991.12.22
Title 名称 Automatic eraser for blackboard
Publication Number
公开号		 1075453 Publication Date
公开日		 1993.08.25
Approval Pub. Date Granted Pub. Date
International Classification 分类号 B43L21/00
Applicant(s) Name
申请人		 Chen Caili
Address 地址 152500
Inventor(s) Name 发明人 Chen Caili
Attorney & Agent 代理人

  
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