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| All Patents in class 33/801 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,507,517 | Sep. 02, 1924 | R.M. Robles | Calipers | indicating calipers | |
| 1,539,422 | May 26, 1925 | J.E. Lundquist | Combination Tool | combination tools | |
| 1,571,261 | Feb. 02, 1926 | E.E. Ginter | Combined Compass and Protractor | compasses | |
| 1,968,331 | Jul. 31, 1934 | B.B. Wittfoht | Calipers | calipers | |