
Experimental television receiver used by JL Baird in demonstration, made 1925-1926
1925-1926
1925-1926
1830 (original); 1967 (model)
1930
circa 1930
1931
1924
circa 1930
2000-100 BCE
1927
1931
1930-1931
1928
1934
before 1928
1926
1928
1955; 1830
1927
1925
1924
1927
1928
1925
1924-1927
1931
1925
1924
1927
1926
1931
1928
1925-1928
1927-1929
1926
1926-1928
1930
1927
1801-1892 (prepared); 1946 (element replaced)
1930
1928
4000-2001 BCE
1934
1839 (original); circa 1988 (replica)
1924-1930
1929
1926
1924
1931
circa 1927
1990-96