 Benz soon patented the speed regulation system, the ignition using sparks with battery, the spark plug, the carburetor, the clutch, the gear shift, and the water radiator.Problems arose again when the banks at Mannheim demanded that Bertha and Karl Benz's enterprise be incorporated due to the high production costs it maintained.The Benzes were forced to improvise an association with photographer Emil Bühler and his brother (a cheese merchant), to get additional bank support.