A monoplane designed and built by Hilsmann circa 1909-10 was given its first trials at Essen, and several long jumps of 60 to 100 metres were made.
The “Niederrheinsche Flugzeug-Bbauanstalt Altenessen” Type e or Type d, was built in 1911.
Hilsmann Monoplane
All Aero 