EntityQ34085715· pop 5· linked from 7 articlesTM triodeSign in to saveFrench 1915 vacuum triodeConnectionsvacuum tubeEntityUnited StatesCountryRussiaCountryFranceCountryGermanyCountryUnited KingdomCountryNetherlandsConceptCzech RepublicCountryFrenchEntitySoviet UnionConceptWorld War IConceptnitrogenEntityLyonEntityInternational Standard Book NumberEntitynickelEntitytungstenEntitymolybdenumEntityelectric currentEntityvacuumEntityNobel Prize in PhysicsEntityCategories1915 in France1915 in radio1915 in technologyFrench inventionsHistory of radioVacuum tubes