Synchronous mains electric clock of the self-starting type
1934
1934
circa 1927
circa 1930
1938
1938
1928
1935
circa 1930
1937
1937
1930
1928
1931
1936
1931
1931
1935
1930
1935
1936
1929-1935
1924
1933
1935
circa 1930
1934
1927
1934
1936
1928
1927
1935
1935
1939
1932-1936
1934-1935
2000-100 BCE
1936
1938 and 1951
1929-1935
1927
1938
1938
1938
1938
1930-1931
1935
1937-1937
1935
1938