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| All Patents in class 33/489 | |||||
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| Number | Date | Patentee | Title | Type | |
| 115,019 | May 23, 1871 | E. Bostock | Improvement in adjustable rulers | ||
| 568,192 | Sep. 22, 1896 | F. Cramblitt | Key Seat Rule | rule attachments | |
| 700,156 | May 13, 1902 | R.J. Simpson | Draftsman's Scale | rules | |
| 854,325 | May 21, 1907 | H.F. Belcher | Desk Ruler | rules | |