
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
1955; 1830
1925
1924
1925
1923
1934
circa 1925
2000-100 BCE
1923
1925
1924
1924
1924
1925
1925
1925; 1862
1801-1892 (prepared); 1946 (element replaced)
1924
1924
1923
1923
1925
4000-2001 BCE
1930 (replica); 1834 (original)
1925
1923
1923
1934
1923
1923
1956-09
1952-3
1936
1956-09
1610; 1923
1668; 1924
1925
2050-1750 BCE
1990-95
1730-1760 (original); 1931-1939 (replica)
1924
1879 (1956)
1956-09
1580-1588; 1930
2000-1001 BCE