
'Cat's whisker' Crystal Radio
1920-1925
1920-1925
circa 1920
1840s-1900
1934
circa 1810
1861 - 1900
circa 1861
1835
1840-1920
1801-1900
1846
1948
1839-1887
1855
1869 to 1897
circa 1900
1877
1950-1951
2021
circa 1980
1844
circa 1860
circa 1842
1840-c. 1920
1889
1880-1890
1934-04
1930-06-28
1930-06-28
1925-1935
1887
1880
1930-1940
1950-1960
1800-1850
1885-1900
circa 1888
05 July 1948
2021
1817-1823
1910-1915
circa 1849
1890-1895
1915-1925
circa 1900