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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
G01L23/06—Indicating or recording by optical means
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FR745887D1932-11-171932-11-17Dispositif pour la mesure des variations périodiques de pression
ExpiredFR745887A
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