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| Patents for H. K. Parsons | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,282,037 | Oct. 22, 1918 | L.W. Bugbee | Grinding Machine | ||
| 1,408,339 | Feb. 28, 1922 | L.W. Bugbee | Protractor for Optical Work | protractors | |