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| All Patents in class 432/153 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,994,678 | Nov. 30, 1976 | J.W. Nelson | Heater for billets | ||
| 4,125,365 | Nov. 14, 1978 | J.W. Nelson | Roll through billet heater | ||