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| All Patents in class 33/268 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,428X | Feb. 25, 1836 | W.A. Burt | Solar Compass | surveyor | |
| 13,584 | Sep. 18, 1855 | J. Stinson | Instrument for Determining Latitude and Longitude | surveyor | |
| 362,960 | May 17, 1887 | H. Harild | Instrument for Ascertaining the Variation of the Compass | measuring apparatus | |