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| Patents for Service Diamond Tool | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,844,957 | Jul. 29, 1958 | L. Small | Motorized hardness tester | metal hardness testers | |
| 2,921,485 | Jan. 19, 1960 | L. Small | Method of forming a diamond tool | grinder dressers | |