Synchronous mains electric clock of the self-starting type
1934
1934
1938
1938
1935
1940
1937
1937
1931
1936
1931
1931
1935
1940
1935
1936
1933
1935
1934
1934
1936
1935
1935
1939
1932-1936
1934-1935
1940
1935
1937-1937
1937-1938
1934
1937-1938
2000-100 BCE
1936
1938 and 1951
1938
1932-1942
1938
1938
1938
1940
1942
1938-1940
1935
1938
1938
1932
1955; 1830
circa 1938
1932
1933