Cascade Wing Designs?

OM

OM

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...A NACA Langley clip of a Cascade Wing design:

http://www.youtube.com/watch?v=TTXd0Rakii8

...Anyone have any more details on this one and/or have any better luck with the search engine finding same?
 
A NACA photo of the same:
 

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And the Beechcraft PD.159-1-1 Cascade project, which used the same lift principles:

http://www.secretprojects.co.uk/forum/index.php/topic,12266.0
 
The earliest multiple-wing "Venitian blind" design I have found is this "Super-Safe Aircraft" of 1931 by T. A. E. Lake:
 

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