Kühne engines were manufactured around 1924.

-They were intended for light aircraft or motorgliders.

-The Kühne engine had two horizontally opposed cylinders with 593 cc of displacement, 84 mm bore and 96 mm stroke.

-It gave 12 hp at 1,600 rpm and reached 24 hp at 2,800 rpm.

From Appendix 12: Horizontally-opposed two-cylinder engine (boxer) that gave 24 CV at 2,800 rpm. Towards the year 1925.

“Kühne boxer engine”