Replica of the first Morse telegraph, 1835
1934
1934
1930
circa 1930
circa 1930
circa 1930
1931
1931
1931
1930
2000-100 BCE
1930-1931
1955; 1830
1990-96
1930
1934
1929
circa 1929
1930 (replica); 1834 (original)
1801-1892 (prepared); 1946 (element replaced)
1930
1930
1931
1931
1929
1903 (original); 1982 (model)
1830 (original); 1967 (model)
1930
4000-2001 BCE
1931
1930
1930
1950-1920
1971-1900
circa 1930
1931
1930
1930
circa 1930
circa 1930
1930
1930
1930
1931
1930
1929
2000-1350
1930
1929-1930
1930
circa 1930