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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7/00
Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
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G01L7/18
using liquid as the pressure-sensitive medium, e.g. liquid-column gauges
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G01L7/187
with optical transmitting or indicating means
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