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| Patents for Alex H. Galt | |||||
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| Number | Date | Patentee | Title | Type | |
| 186,638 | Jan. 23, 1877 | W. Thomson | Compass needle combines ultra-low friction with high polar moment of inertia. | ||
| 210,068 | Nov. 19, 1878 | W. Thomson | Navigational instrument for use with the mariners' compass | ||