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| All Patents in class 428/586 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,359,477 | Oct. 03, 1944 | J.H. Hoern | Method of Making Hollow Head Valves | ||
| 2,456,856 | Dec. 21, 1948 | C.J. Bath | Bolster Block | ||