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      Prototype design                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Testing
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
  Sep                                           Oct 2020                                                                                                                              Nov 2020                                                                                                                     Dec 2020                                                                                                               Jan 2021                                                                                                                       Feb