RARE DOUGLAS AIRCRAFT DC-4 ERA LETTERS PATENT DESIGN 104110 4/13/1937 DIAGRAMS For Sale

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RARE DOUGLAS AIRCRAFT DC-4 ERA LETTERS PATENT DESIGN 104110 4/13/1937 DIAGRAMS :
$90.00

RARE DOUGLAS AIRCRAFT DC-4 ERA LETTERS PATENT DESIGN 104110 4/13/1937 DIAGRAMS*One of a kind document*
This patent letter is from 1937. I could not positively identify the Douglas Aircraft model (please let me know if you can help in identifying this aircraft model). The airplane was designed by earl Schuyler Kleinhans.
I will be listing other DOUGLAS AIRCRAFT LETTERS PATENT DESIGNS over the next couple of weeks.