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* Pioneering nature of the maple leaf was not let go, officially because of the need to develop this line as well as a number of supporting technologies, such as vanadium steel, electric lights, four-cylinder engine integration, electromagnetic ignition system, fuel tank, and later a troubled Model T large defects, cooling systems, natural maple leaf made at the outset to develop cooling system requirements, the results of automotive research center developed a really take years or even ten years before the birth of the cross-flow cooler. window 7 enterprise product key,windows 7 retail key   It is because of these , Even though the car had some information provided by the maple leaf still it took three years to develop successful. window 7 enterprise product key,windows 7 retail key