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| All Patents in class 33/401 | |||||
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| Number | Date | Patentee | Title | Type | |
| 697,718 | Apr. 15, 1902 | T.F. Hickey | Level | levels | |
| 782,779 | Feb. 14, 1905 | T.F. Deck | Gravity Level | inclinometers | |
| 941,368 | Nov. 30, 1909 | M. Ichtertz | Inclinometer with Direct-Reading Dial | inclinometers | |
| 1,426,645 | Aug. 22, 1922 | H.C. Hornbeck | Inclinometer | inclinometers | |
| 1,437,164 | Nov. 28, 1922 | F. Bachila | Level | inclinometers | |