Synchronous mains electric clock of the self-starting type
1934
1934
1938
1938
1943
1935
1940
1937
1937
1936
1935
1940
1935
1936
1933
1935
1934
1934
1936
1935
1935
1939
1934-1935
1940
1935
1937-1937
1937-1938
1934
1943
1937-1938
2000-100 BCE
1936
1938 and 1951
1938
1938
1938
1938
1940
1942
1938-1940
1935
1938
1938
1955; 1830
circa 1938
1933
1942
1934
1942
1937
1939