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G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
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FR840640D1937-12-281937-12-28Perfectionnement aux dispositifs de mesure des pressions
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Perfectionnements apportés aux procédés et dispositifs électriques pour la mesure des variations de distance entre deux points, par variation de capacité