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    Title :

    Drag or negative traction of geared down supporting propellers in the downward vertical gilde of a helicopter


    Additional title:

    geared-down


    Contributors:


    Publication date :

    1920


    Size :

    5 Bl.


    Type of media :

    Miscellaneous


    Type of material :

    Print


    Language :

    English


    Classification :

    RVK:    ZO 7000