Specimen of steel produced by the Basic or Thomas-Gilchrist process
1877
1877
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1951-1961
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
1920-1960
circa 1921
1896
1893
1910
1959