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| All Patents in class 33/357 | |||||
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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 | ||
| 517,029 | Mar. 27, 1894 | C.T. Clausen | Instrument for adjusting the magnetic deviation of the mariners' compass | ||