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| All Patents in class 432/224 | |||||
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| Number | Date | Patentee | Title | Type | |
| 821,591 | May 22, 1906 | B. Holmes, E.F. Holmes | Barrel Heater | barrel making machines | |
| 3,960,093 | Jun. 01, 1976 | D.R. Gregory | Portable Forge | portable forges | |