The company is Breuer Werke GmbH, in Frankfurt am Main/Höchst.

-They manufactured aircraft , boat, and stationary engines. The aircraft engines were used in light aircraft, as they were small air-cooled, 5-cylinder radial engines.

-The following two models are known:
The 9-091 (5-F-8) that gave 45 CV and the 9-094, similar to the latter but giving 65 CV.

From appendix 10: Five-cylinder radial engine that gave 45 hp. It was shown at the aeronautic exhibition in Belgrade.

-The "9.091 A-1" 5-cylinder radial engine giving 40/45 CV appears now in a double-view image, rear and lateral.

“Breuer 9.091 A-1 engine” (PiP-Flu)

-There has also appeared, from a pre-WWII magazine, a cross-section of the engine mentioned above.

“Breuer 0.091 A-1 diagram” (PiP-Flu)