Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01L
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
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G01L21/16
by measuring variation of frictional resistance of gases
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G01L21/22
using resonance effects of a vibrating body; Vacuum gauges of the Klumb type
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