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Publication of FR646025ApublicationCriticalpatent/FR646025A/fr
H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
H01T13/00—Sparking plugs
H01T13/48—Sparking plugs having means for rendering sparks visible
FR646025D1927-12-211927-12-21Appareil de contrôle du fonctionnement des moteurs à explosion et plus spécialemeut de leur allumage
ExpiredFR646025A
(fr)