Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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2291/00
Indexing codes associated with group G01N29/00
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G01N2291/04
Wave modes and trajectories
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G01N2291/044
Internal reflections (echoes), e.g. on walls or defects
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