Synchronous mains electric clock of the self-starting type
1934
1934
1938
1938
1945
1946
1948
1946
1943
1948
1947
1935
1940
1937
1937
1945
1936
1946
1949
1935-1945
1935
1947
1940
1935
1936
1939-1945
1933
1935
1934
1944-1945
1934
1936
1946
1948
1940-1945
1935
1935
1940-1949
1939
circa 1950
1934-1935
1940-1944
2000-100 BCE
1936
1938 and 1951
1940
1938
1938
1948
1938
1938