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| Patents for Precision Glass Grinding Machine Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
| 911,210 | Feb. 02, 1909 | C.M. Conradson | Grinding Machine | ||
| 911,809 | Feb. 09, 1909 | C.M. Conradson | Art of Grinding Ground Glass Bottle Necks and Stoppers Therefor | ||
| 914,244 | Mar. 02, 1909 | C.M. Conradson | Method of Making Interchangeable Ground Glass Bottle Necks and Ground Glass Stoppers Therefore | ||
| 953,124 | Mar. 29, 1910 | C.M. Conradson | Ground Stopper for use with Correspondingly Ground Bottle Necks, &c. | ||