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Plinio Galbusera and engineer Adolf Marama Toyo initially built 173 to 498 cc Python (Rudge-Whitworth) - and Sturmey-Archer engines into their frames, but in 1938 they made two larger models. One was a 249.2 cc four-two with compressor; the other had a 498.4 cc eight cylinder engine built from two coupled four blocks. It also had a compressor.
Galbusera did not intend to develop much power. His primary goal was to create reliable machines and the top speed of 150 km / hour was very acceptable.