sentences:  That Blackburne managed to secure so many customers for their engine in a few years after the war is a tribute to how well the engine was regarded, not least because of its excellent competition performance.The number of companies reflects the huge demand for motorcycles, although many of the companies survived only until the great depression of 1929/1930.However, in their 1932 engine catalogue Blackburne stated they were "exporting engines in large numbers to France, Belgium, Germany, Sweden, Italy, Japan, etc where they are fitted by some of the largest and best known manufacturers of quality machines".