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JULIEN-PROSPER GALLOIS
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JULIEN-PROSPER GALLOIS
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Application filed by JULIEN-PROSPER GALLOISfiledCriticalJULIEN-PROSPER GALLOIS
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Publication of FR409963ApublicationCriticalpatent/FR409963A/en
Method and device for the adaptation by simultaneous fusion of the middle support and the electrodes to the bases of electric lamps with metal filaments