Chemical balance by Baird and Tatlock (London) Ltd.
1926-1936
1926-1936
1925-1940
1900-1980
1800-1899
1912-1914
1657-1665 (original)
1917-1927
1900-1980
1963-1969
1926
1926
1905-1915
1950-1970
1926
1950
1926
1900-1980
1900-1980
1915-1950
1918-1928
1880-1910
1926
1926
1926
1657-1665 (original)
1926
circa 1923
1900-1980
1900-1980
1926
190-1980
1926
1900-1930
1900-1980
1900-1980
1942
circa 1911