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| All Patents in class 220/326 | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 943,825 | Dec. 21, 1909 | F. Hardinge | Receptacle | |
| 1,291,820 | Jan. 21, 1919 | W.F. Folmer | Photographic Dark Box | ||
| 3,120,879 | Feb. 11, 1964 | D.J. Warner | Oil Cup With Integral Spring | ||