1               2               3               4               5               6               7               8               9          10              11              12              13              14              15                       
                                                                                                                  Test prototype                                                                                                                       
                                                                                                                                                                                                                                                       
                                                                                                                Prototype completed                                                                                                                    
                                                                                                                                                                                                                                                       
                                                                                                                                                                  Setup assembly line                                                                  
                                                                                                                                                                                                                                                  Setup
                                                                                                                                                                                                                                                       
                                                                                                                                                  T2                                                                                                   
                                                                                                                                                                                                                                                       
                                                                                                                                                      T3                                                                                               
                                                                                                                                                                                                                                  T4