This invention is for automatic move upward and downward device of full framed board for education blackboard or bulletin board, on which educator write as high as he wants by moving it upward or downward to show it well in the distance.


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    Title :

    AUTOMATIC BLACKBOARD RAISING/LOWERING DEVICE


    Contributors:

    Publication date :

    2016-05-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / B43L Artikel zum Beschreiben oder zum darauf Zeichnen , ARTICLES FOR WRITING OR DRAWING UPON



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