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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9/00
Prospecting or detecting by methods not provided for in groups G01V1/00 - G01V8/00
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G01V9/007
by detecting gases or particles representative of underground layers at or near the surface
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