'Cat's whisker' Crystal Radio
1920-1925
1920-1925
1905
circa 1983
1998
2000-2004
1886
1846
1956
2013
1983
1835
1950
1955
1947
1883
circa 1810
c1860
2021
1861 - 1900
1870-1910
1890 - 1900
1950
2007
1830-1940
circa 1842
2021
circa 1861
1948
1850-1940
1976
circa 1947
2012-2016
c1860
2014
2000
2015
circa 1872
1980-2015