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| All Patents in class 33/356 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,786X | Jun. 28, 1836 | N. Bassett | Compass Needle | surveyor | |
| 210,066 | Nov. 19, 1878 | W. Thomson | Magnetic compass deflector | ||
| 517,029 | Mar. 27, 1894 | C.T. Clausen | Instrument for adjusting the magnetic deviation of the mariners' compass | ||