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| All Patents in class 401/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 60,315 | Dec. 04, 1866 | B. Worcester | Improvement in Scale Pencils | marking gauges | |
| 341,081 | May 04, 1886 | E. Weissenborn | Compass Attachment for Pencils | compasses | |
| 575,671 | Jan. 19, 1897 | J.B. Smith, G.W. Watt | Telescoping Measuring-Rule | measuring rods | |
| 1,176,141 | Mar. 21, 1916 | C.L. Heisler | Erasing Pencil | writing instruments | |