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PCE
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CPC Subgroup
G01P 5/20

using particles entrained by a fluid stream (G01P5/22 takes precedence)

Full Title

Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft (application of speed-measuring devices for measuring volume of fluid G01F) > by measuring the time taken to traverse a fixed distance > using particles entrained by a fluid stream (G01P5/22 takes precedence)