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| All Patents in class 33/773 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,494,039 | Feb. 10, 1970 | I.C. Porter | Map Scaling Device | ||
| 3,688,410 | Sep. 05, 1972 | R.M. Aurnou, H.R. Zeidler | Measuring and Display System | measurement gauges | |