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3668790
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Patent Grant
3668790
References
Source
Patent Number
3,668,790
Date Filed
Not available
Date Issued
Tuesday, June 13, 1972
51 years ago
CPC
G09B9/305 - by viewing with a camera a small-scale model of the terrain
G09B25/06 - for surveying for geography
US Classifications
434 - Education and demonstration
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