
Callendar's Original Radio Balance, 1905-1906
1905-1906
1905-1906
1849
1874
1883
1908-1909
1880-1890
1868
1850-1970
1853-1858
1867-1873
1875-1892
1856-1866
1877-1904
1871
1866
1935
1926
1900-1920
1833
1914
1914
1910-1914
1914-1939
1804-1807
1862-1922
circa 1955
1873
1860
1860
1871
1890
1917-1958
1897
1911-1921
1895
1850-1900
1935
1900
1899-1909
circa 1905
1850-1860
circa 1854
1949; circa 1954-1995