Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01V
GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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8/00
Prospecting or detecting by optical means
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G01V8/10
Detecting, e.g. by using light barriers
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G01V8/12
using one transmitter and one receiver
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G01V8/18
using mechanical scanning systems
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