Maybe a strange question, but I need every help there is because the subject is very difficult.
The Nielsen & Winther factory (Kopenhagen), started at the end of WWI a cooperation with Thulin Sweden concerning building aeroplanes.
At the Thulin factory the designed a fighter biplane special for Denmark, it based on the lines of the Nieuport Bebe, Thulin M.
In a little modified version it was build at N&W as type Aa.
Concerning this type there is information to find.
BUT: they build also the following types, and now I hope that some of you can help me with details, such as dimensions, pictures, drawins?, etc.
This are the types:
I hope to hear from you