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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21/00
Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
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G01C21/26
specially adapted for navigation in a road network
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