Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01C
MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
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15/00
Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
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G01C15/002
Active optical surveying means
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G01C15/004
Reference lines, planes or sectors
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G01C15/006
Detectors therefor
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