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| All Patents in class 221/240 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,747,769 | May 29, 1956 | W.E. Erickson | Seal Stripping and Opening Device | ||
| 2,752,030 | Jun. 26, 1956 | W.E. Erickson | Magnetic Seal Clamp | ||
| 2,823,816 | Feb. 18, 1958 | W.B. Eddison | Seal Transferring Apparatus | ||