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| All Patents in class 220/326 | |||||
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| Number | Date | Patentee | Title | Type | |
| 943,825 | Dec. 21, 1909 | F. Hardinge | Receptacle | ||
| 1,291,820 | Jan. 21, 1919 | W.F. Folmer | Photographic Dark Box | film and plate holders | |
| 3,120,879 | Feb. 11, 1964 | D.J. Warner | Oil Cup With Integral Spring | oil cups | |