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| All Patents in class 396/339 | |||||
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| Number | Date | Patentee | Title | Type | |
| 833,886 | Oct. 23, 1906 | H.W. Locke | Plateholder Attachment for Cameras | film and plate holders | |
| 1,045,539 | Nov. 26, 1912 | W.F. Folmer | Multiplying Back for Cameras | camera accessories | |
| 1,544,970 | Jul. 07, 1925 | W.F. Folmer | Latch, Multiplying Back for Cameras | camera accessories | |