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| Number | Title | Issue Date |
| 6240647 | Orienteering compass and distance measuring device The invention relates to an orienteering compass comprising a distance measuring device (4) including a circular element (11) to be rotated over a map from an arbitrary point A to an arbitrary point B for determining the distance from point A to point B. ... | 06/05/2001 |
| 4217696 | Time-distance calculator A device for measuring linear or curvilinear map distance and determining the rate or time of travel represented by such distance. The device includes an elongate, hollow body having a slot extending along a portion of its length, an indicator shiftable a... | 08/19/1980 |
