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| All Patents of Type: magnetic compasses | |||||
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| Number | Date | Patentee | Title | Type | |
| 362,960 | May 17, 1887 | H. Harild | Instrument for Ascertaining the Variation of the Compass | measuring apparatus | |
| 441,777 | Dec. 02, 1890 | J.L. Simmons | Explorer's Instrument | magnetic compasses | |