Berger BX-50 (Switzerland) was a single-seat light helicopetr flown in prototype form in the 1970s. Powered by a 67kW Continental C90 flat-four engine.

Berger BX-110 was a two-seat light helicopter powered by a 134kW Wankel rotating piston engine. Prototype flew for the first time on 3 June 1974.

Source:

• M.Taylor "Jane's Encyclopedia of Aviation"

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