
Gecophone Crystal Detector Radio Set No. 1, 1923
1923
1923
1830 (original); 1967 (model)
1924
1923
1923
1924
1923
1955; 1830
1934
2000-100 BCE
1924
1990-96
1801-1892 (prepared); 1946 (element replaced)
1924
1934
1952-3
1839 (original); circa 1988 (replica)
4000-2001 BCE
1930 (replica); 1834 (original)
1923
1924
1923
1923
1923
1923
1923
1924
1903 (original); 1982 (model)
1936
8500-2000 BCE
1925; 1862
1960-1979
1962-07
1968-04
1938-11
1938-11
1938-11
1923
1924
1924
1924
1924
1923
1923
1924
1924
1923
1923
circa 1924
1924