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| All Patents in class 92/194 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,287,456 | Jun. 23, 1942 | R.C. Springston | Sealing Means | shaft seals | |
| 2,814,540 | Nov. 26, 1957 | H.I. Southerwick | Piston Packing | ||