
'Cat's whisker' Crystal Radio
1920-1925
1920-1925
1974
1998
2013
1911
1905
1775
1886
1890 - 1900
2007
1983
circa 1983
1846
1984; 1983
1950
1870-1910
1956
1934
1861 - 1900
circa 1861
1835
1981-1982
1948
1839-1887
circa 1810
1880-1920
1815
1799
1880-1950
1898
1830-1850
1880-1940
circa 1880-1920
circa 1880-1920
circa 1920
1850-1856
1850-1900
1806
1899
1927
1940-1950
1916
1830-1840
circa 1890