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| All Patents in class 451/41 | |||||
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| Number | Date | Patentee | Title | Type | |
| 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 | ||
| 2,601,630 | Jun. 24, 1952 | R.J. Rahn, I.J. Rahn | Angle block and method of manufacture | measuring tools | |