Seeking some tough WWI info

The major forces in WWI used aircraft for recon. I have a good friend
who is seeking information on the cameras used for this purpose.
He is looking for information on all major forces other than the U.S.,
especially Russia.
Also seeking info on two partcular people, Ing.Sergei Ulyanin and
Ing.Potte, both of whom designed cameras used in aerial photo recon.
He also has a long term interest in aeral radio and telegraphic
communcation in WWI.
If anyone has materal that may help would you please drop me a line.
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