 
                   1783                                                               
     
    1492        1727      235                                                                            
          18                     1733 ᠣᠨ          5                    1765                           1769              1774 1779                               1785                                     1784             1736 1819                                                              
    1763 1764                                                                                                                                               1769                                                   
     1783                                                                                                  
         
                                                                                                                    
                          18    19                            1776       1798                                                                                                                                                                  
      
                                                                                                                 
                                                                                                    
                                                                                                        
                                      


Uniflow_steam_engine