5" diameter bunsen burner by F.E. Becker and Co. London
1900
1900
1885-1889
1900-1945
1900-1945
1900-1945
circa 1886
circa 1886
circa 1886
1900-1906
1856-1900
1900-1945
1900-1945
1900-1945
1900-1906
1901-1910
1915
1904
circa 1886
1918-1925
1909-1919
circa 1886
1900-1907
1886