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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3/00
Measuring distances in line of sight; Optical rangefinders
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G01C3/32
by focusing the object, e.g. on a ground glass screen
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