  
    1807                                                              
       
                          1788              1807                            1811                                              17        350                     7            
            19                                       1910                                                
        
                              1895                          20   50                                20   50                                                                     1959             1956          
                                                                                          15                                                
       
               1807                                                   8                                                                            
                                                                        19                    1910                20                                                         1935                                                 20   60                               GPS     


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