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| All Patents in class 403/270 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,447,085 | Aug. 17, 1948 | W.H. Odlum | Welded joint | ||
| 2,604,229 | Jul. 22, 1952 | E. Schwarz | Closure Seal for Vacuum Vessels | manufacturing processes | |