Bernhard Nagle of Maschinen & Motorenfabrik, Stettin, Giesebrechtstraße 6 (now Poland) built 147cc and 197cc four-stroke engines which he fitted to light motorcycles. The smaller version was also sold as a bicycle attachment engine.
These were also fitted to the Difra machines which may have been produced by the same company, and were supplied to Liliput, Braak, Cyclop, and to Bleha around 1923, an advertisement for which read "1½ Ps. Namopo-Einbau-Motor".
Sources: Tragatsch p225, prawobrzeze.eu, period documents.
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