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| Patents for J. W. Robertson | |||||
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| Number | Date | Patentee | Title | Type | |
| 194,698 | Aug. 28, 1877 | E.A. Marsh | Improvement in music-supports | music instrument maker | |
| 564,296 | Jul. 21, 1896 | O.S. Walker | Magnetic chuck | magnetic chucks | |