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G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
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FR856404D1939-06-161939-06-16
Amplifier device for small variations in gas pressure and its applications
ExpiredFR856404A
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