This Prague-based manufacturer, formally known as Jaroslav Sibrava, továrna motorových vozidel, emerged from the discontinued three-wheeler production of the local firm J. Walter, which had built such vehicles from 1910 to 1918. Jaroslav Sibrava took over this line of work in 1921, launching a three-wheeled vehicle called the Trimobil. The Trimobil was initially powered by an air-cooled V-twin engine of 1248cc producing 9bhp, later replaced by flat-twin engines of the…