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G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
G05D7/00—Control of flow
G05D7/01—Control of flow without auxiliary power
G05D7/0186—Control of flow without auxiliary power without moving parts
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FR412913D1909-02-221910-02-21Procédé et appareil pour l'écoulement de gaz à volume constant et indépendamment de leur poids spécifique
ExpiredFR412913A
(fr)