Table:
text: European motorcycle Grand Prix
By year
By year
Year_ Designated_Grand_Prix Track _250_cc _350_cc _500_cc Report
1948 Ulster Grand Prix Clady Maurice Cann Freddie Frith Enrico Lorenzetti Report
1947 Swiss Grand Prix Bremgarten Bruno Francisci Fergus Anderson Omobono Tenni Report
1946 - 1938 Not held Not held Not held Not held Not held Not held
1937 Swiss Grand Prix Bremgarten Omobono Tenni Jimmie Guthrie Jimmie Guthrie Report
1936 German Grand Prix Sachsenring Henry Tyrell-Smith Freddie Frith Jimmie Guthrie Report
1935 Ulster Grand Prix Clady Arthur Geiß Wal Handley Jimmie Guthrie Report
1934 Dutch TT Assen Walfried Winkler Jimmie Simpson Pol Demeuter Report
1933 Swedish Grand Prix Saxtorp Charlie Dodson Jimmie Simpson Gunnar Kalén Report

Question: What year did Freddie Frith and Enrico Lorenzetti win the 350cc and 500cc European Motorcycle Grand Prix?

Question: Who won the 350 at the Sachsenring among European motorcycle grands prix?