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OK-UAA-40 is possibly a misread for OK-UAA-90, a Fokker Dr.1 UL replica with fake registration 1425/37 which also was at Poznan Airshow. Was it a red triplane?
OK-IUG-16 is a DFW C.V replica
OK-SAA-44 is a Curtiss Jenny (replica)
These (ultralight) replicas belong to the Pterodactyl Club, who have quite a collection.