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| All Patents in class 235/61GM | |||||
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| Number | Date | Patentee | Title | Type | |
| 697,335 | Apr. 08, 1902 | I.B. Hagan | Measuring Instrument | protractors | |
| 756,055 | Mar. 29, 1904 | L.B. Rhodes | Protractor Rule | folding rules | |
| 912,605 | Feb. 16, 1909 | O.A. Osmonson | Combined Bevel and Square | bevels | |
| 1,730,852 | Oct. 08, 1929 | W. Jenny | Angle and Hypotenuse Measuring Instrument | protractors | |
| 3,087,246 | Apr. 30, 1963 | T.N. Busch | Determining reference plate for surface plate inspection | measuring tools | |