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| All Patents in class 356/139 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,363,877 | Nov. 28, 1944 | H.R. Larsen, J.B. Sonderman | Theodolite | |
| 2,480,237 | Aug. 30, 1949 | V.W. Towns, C.J. Godfrey | Optical Device for Accurate Reading of Annular Scales | ||