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| All Patents in class 411/530 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,932,796 | Oct. 31, 1933 | N.F. McNaught | Grease ram | ||
| 2,966,104 | Dec. 27, 1960 | R.L. Dalton | Range Finder for Photographic Cameras | camera range finders | |