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| All Patents in class 277/922 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,013,823 | Dec. 19, 1961 | G.H. Schulz | Seal | ||
| 3,191,945 | Jun. 29, 1965 | R.H. Andresen | Rotary Seal With Supporting Sleeve | ||
| 3,288,474 | Nov. 29, 1966 | R.J. Gits | Bellows Seal Structure | ||