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| All Patents in class 248/171 | |||||
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| Number | Date | Patentee | Title | Type | |
| 23,428 | Mar. 29, 1859 | H.J. Lewis | Camera-stand | camera tripods | |
| 2,297,927 | Oct. 06, 1942 | V.E. Whitman | Tripod Particularly Applicable to Photographic Cameras | camera tripods | |
| 3,629,910 | Dec. 28, 1971 | C.C. Hsiao, R.C. Kirberg | Handle Assembly for Picture Projection Screen | audio-visual apparatus | |