
Gecophone Crystal Detector Radio Set No. 1, 1923
1923
1923
1839 (original); circa 1988 (replica)
1830 (original); 1967 (model)
1903 (original); 1982 (model)
1990-96
1922
1955; 1830
1927
1925
1924
1927
1925
1923
1924-1927
1934
circa 1925
2000-100 BCE
1923
1925
1927
1924
1924
1927
1926
1926
1922-1923
1922-1923
1922-1923
1922-1923
1926
1924
1925
1925
1925; 1862
1927
1922-1923
1924-1927
1801-1892 (prepared); 1946 (element replaced)
1922
1922-1925
1924
1922-1924
1924
1925-1926
1922
1922-1925
1923
1923
1925
4000-2001 BCE