Synchronous mains electric clock of the self-starting type
1934
1934
1932
1934
1931
1934
1931
1934
2000-100 BCE
1955; 1830
1934
1932
1933
Before 1932
1931
1932
1933
1933
1933
1934
1990-96
1934
1931
1932-1933
1934
1931
1903 (original); 1982 (model)
4000-2001 BCE
1933
1931
Before 1932
1801-1892 (prepared); 1946 (element replaced)
1830 (original); 1967 (model)
1934
1932
1933
1934
circa 1932
circa 1932
1989-08
circa 1932
1931
circa 1932
circa 1932
1932
1933
1931
1934
1932
1730; 1967
1931