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| All Patents in class 428/138 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,850,857 | Mar. 22, 1932 | F. Weindel, Jr. | Greeting card | ||
| 3,470,598 | Oct. 07, 1969 | V. Berthelsen | Method of making structural elements | ||