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| All Patents in class 220/324 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,245,298 | Nov. 06, 1917 | A. Winton | Handhole Structure | engine bases | |
| 2,273,455 | Feb. 17, 1942 | L.D. Nadel, V.E. Whitman | Combined Hinge and Latch Structure of General Application | cameras | |