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| All Patents in class 33/352 | |||||
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| Number | Date | Patentee | Title | Type | |
| 230,440 | Jul. 27, 1880 | J. Russell | Carpenter's Gage Tool | ||
| 420,242 | Jan. 28, 1890 | C.E. Nielsen | Plumb Level | inclinometers | |
| 960,718 | Jun. 07, 1910 | F. Schtabe | Level Attachment for Drills | levels | |