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| Patents for Harold C. Johnston | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,817,103 | Dec. 24, 1957 | H.C. Johnston | Dressing tool | ||
| CA-562,616 | Sep. 02, 1958 | H.C. Johnston | Dressing tool | ||
| 2,926,654 | Mar. 01, 1960 | H.C. Johnston | Grinding wheel dresser | grinder dressers | |