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| All Patents in class 138/92 | |||||
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| Number | Date | Patentee | Title | Type | |
| 132,699 | Oct. 29, 1872 | M. Stephens | Improvement in pipe-couplings | pipes | |
| 2,604,229 | Jul. 22, 1952 | E. Schwarz | Closure Seal for Vacuum Vessels | manufacturing processes | |