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| All Patents in class 33/359 | |||||
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| Number | Date | Patentee | Title | Type | |
| 103,701 | May 31, 1870 | L.F. Arson | Improvement in Correcting the Deviation of the Mariners' Compass | ||
| 210,066 | Nov. 19, 1878 | W. Thomson | Magnetic compass deflector | ||
| 210,069 | Nov. 19, 1878 | W. Thomson | Magnetic adjustment mechanism added to the mariners' compass | ||
| 217,015 | Jul. 01, 1879 | S. Longfellow | Add-on corrective magnets | ||