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| All Patents in class 70/370 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,487,803 | Nov. 15, 1949 | H. Heimann | Spring retaining ring | fasteners | |
| 5,634,359 | Jun. 03, 1997 | D.A. Huebschen | Removable Core Lock with Latch Alignment and Limited Latch Rotation | ||