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2172098
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Patent Grant
2172098
References
Source
Patent Number
2,172,098
Date Filed
Not available
Date Issued
Tuesday, September 5, 1939
84 years ago
CPC
G01C3/12 - with monocular observation at a single point
G01C3/24 - using a parallactic triangle with fixed angles and a base of variable length in the observation station
US Classifications
356 - Optics: measuring and testing
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