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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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FR750290A1957-10-261957-10-26Appareil pour la mesure de différence de pression
ExpiredFR73029E
(fr)