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| All Patents in class 33/798 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,841 | Oct. 30, 1849 | W.I. Van Ness | Transverse Calipers | calipers | |
| 159,246 | Feb. 02, 1875 | C. Caton | Combined Calipers, Dividers, etc. | dividers | |
| 499,039 | Jun. 06, 1893 | J.C. Reimann | Calipers | calipers | |
| 1,178,896 | Apr. 11, 1916 | F.J. Wolff | Measuring Device | calipers | |