The so-called E-wing fitted on one of the Finnish Fokker D XXIs.

Самолёты на фотографии: Aircrafts on the photo: Fokker D.XXI - НидерландыNetherlands - 1936

The Adamoli-Cattani fighter, which was built in 1918 but abandoned before flight testing could begin.
Designed by Adamoli and Cattani, the fighter was considered the smallest practicable airframe for a 200 hp Le Rhone engine.

Самолёты на фотографии: Aircrafts on the photo: Adamoli-Cattani biplane - ИталияItaly - 1918