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| Patents for Cataract Tool & Optical Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-190,010,493 | Jun. 01, 1901 | H.D. Gibbs, F.L. Smith | Improvements in and relating to mountings for telescope sights for ordnance | firearms | |
| 681,202 | Aug. 27, 1901 | H.L. De Zeng, Jr. | Telescopic mounting for guns | rifles | |
| 690,019 | Dec. 31, 1901 | H.L. De Zeng, Jr. | Telescope | firearms | |
| 691,248 | Jan. 14, 1902 | H.L. De Zeng, Jr. | Telescope-mounting for guns | firearms | |
| 701,520 | Jun. 03, 1902 | H.D. Gibbs, F.L. Smith | Telescope | telescopes | |