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| All Patents in class 432/128 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,906,092 | Apr. 25, 1933 | G.S. Peterson | Conveyer furnace | ||
| 3,994,678 | Nov. 30, 1976 | J.W. Nelson | Heater for billets | ||
| 4,065,249 | Dec. 27, 1977 | J.W. Nelson | Heater for billets | ||