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| All Patents in class 235/64.7 | |||||
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| Number | Date | Patentee | Title | Type | |
| 557,246 | Mar. 31, 1896 | G.F. Wynne | Photographic Exposure Meter | special purpose slide rules | |
| 715,061 | Dec. 02, 1902 | E. Harrold | Photographic timer | ||
| 1,478,956 | Dec. 25, 1923 | E. Harrold | Exposure meter | ||
| 2,343,257 | Mar. 07, 1944 | E.S. Hineline | Exposure Guide for Photographic Cameras, Particularly Aerial Cameras | camera accessories | |