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H01H35/00—Switches operated by change of a physical condition
H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
H01H35/40—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by devices allowing continual flow of fluid, e.g. vane
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FR875426D1940-09-251941-09-05Appareil indicateur à voyant de la présence d'air ou de gaz s'accumulant dans un récipient rempli d'un liquide
ExpiredFR875426A
(fr)