code: def get_uniq_list_dutmodels(self):
          
          models = []
          if self.dutinformations:
              for info in self.dutinformations:
                  models.append(info.platform)
              seen = []
              for item in models:
                  if item not in seen:
                      seen.append(item)
              return seen
          return models
docs: Gets a list of dut models in this TC
          :return: List of dut models in this TC. Empty list if information is not available.