Wilhelm Kress was a pioneer who built a first gasoline engine with aeronautical intent in 1898.

“Kress engine at the Narodni-Prague Museum”

-It had four horizontal opposed cylinders. The manufacturing was carried out by the company of Bernard Adam.

“The same engine, front view” (Photos Evzen Vsetecka)

From Appendix 12: The engine built in 1896 by the pioneer Viktor Kress was manufactured by "Bernard Adam". It is exposed in a Museum of the country and photographed by Evzen V. of AEHS.

“The Kress 4-cylinder boxer” (E.V.-AEHS)