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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9/00
Measuring inclination, e.g. by clinometers, by levels
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G01C9/24
in closed containers partially filled with liquid so as to leave a gas bubble
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G01C9/32
Means for facilitating the observation of the position of the bubble, e.g. illuminating means
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