Hi Hidde,
I found these in "The Imperial Russian Air Service - Famous Pilots and Aircraft of World War I" by Alan Durkota, Thomas Darcey and Victor Kulikov.

Dux built Nieuport 16 of the First Fighter Detachment-winter 1916-19

Grigorovich M-15

Morane-Saulnier I of the 4th Corps Dedachment-winter 1915

Morane-Saulnier-L

Morane-Saunier I of the 4th Corps Detachment-winter 1915

Nieuport 14

Nieuport 21

Nieuport 21 1825 12th Fighte Detachment - winter1917-Jaan M Mahlapuu

Nieuport 21 in flight

Sikorsy-S-16
I hope this helps
Willem van Berkel from Holland
