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| All Patents in class 75/557 | |||||
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| Number | Date | Patentee | Title | Type | |
| 16,082 | Nov. 11, 1856 | H. Bessemer | Improvement in the manufacture of iron and steel | foundryman | |
| 482,001 | Sep. 06, 1892 | B. Brazelle | Process of and apparatus for purifying, refining, and carburizing metals | ||