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| Patents for Precision Truing Machine and Tool Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,395,391 | Nov. 01, 1921 | E.R. Conners | Device for Truing and Dressing Grinding Wheels | grinder dressers | |
| 1,395,392 | Nov. 01, 1921 | E.R. Conners | Device for Truing and Dressing Grinding Wheels | grinder dressers | |
| 1,395,393 | Nov. 01, 1921 | E.R. Conners | Mechanism for Truing and Dressing Grinding Wheels | grinder dressers | |
| 1,395,394 | Nov. 01, 1921 | E.R. Conners | Mechanism for Truing and Dressing Grinding Wheels | grinder dressers | |