
'Cat's whisker' Crystal Radio
1920-1925
1920-1925
1844
1840-1920
1801-1900
1846
1934
1861 - 1900
circa 1861
1835
1948
1839-1887
circa 1810
circa 1920
1840s-1900
1855
1869 to 1897
circa 1842
1950-1951
2021
circa 1980
1877
circa 1900
circa 1860
1935
1886
1929
1889
1935
1874
1860
1880-1890
1948-68
1873
1925
1880-1900
1855-1865
1920-1940
1900-1905
1902-1905
1965
1870-1880
1857
circa 2021
1934-01-15
1930-06-28
01 January 1948
1961-01-18