Angel Guamán Lozano
                (1),                              Juan Fernando Haro VelasteguĂ
                (2),                              Esteban PaĂşl Jordán RodrĂguez
                (3),                              Julio César Moyano  Alulema
                (4),                              Eduardo Francisco GarcĂa Cabezas
                (5),                              Juan Carlos Cayán MartĂnez
                (6)                          
                          
                (1)
                
                  Escuela Superior PolitĂ©cnica de Chimborazo, Faculty of Mechanics, Riobamba, Ecuador,                
                            
                (2)
                
                  INDUCUERDAS Factory, Riobamba, Chimborazo, Ecuador,                
                            
                (3)
                
                  HIDROULBA Company, Ecuador,                
                            
                (4)
                
                  Escuela Superior PolitĂ©cnica de Chimborazo, Faculty of Mechanics, Riobamba, Ecuador,                
                            
                (5)
                
                  Escuela Superior PolitĂ©cnica de Chimborazo, Faculty of Mechanics, Riobamba, Ecuador,                
                            
                (6)
                
                  Escuela Superior PolitĂ©cnica de Chimborazo, Faculty of Mechanics, Riobamba, Ecuador