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Individual
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Individual
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Priority to ES75936ApriorityCriticalpatent/ES75936A1/en
Publication of ES75936A1publicationCriticalpatent/ES75936A1/en
ES75936A1920-10-061920-10-06
Improvements introduced in spark plugs for internal combustion engines, for the ignition of explosives by electricity.
ExpiredES75936A1
(en)