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R Leutwyler Y Cia
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R Leutwyler Y Cia
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Priority to ES83666ApriorityCriticalpatent/ES83666A1/en
Publication of ES83666A1publicationCriticalpatent/ES83666A1/en
Improvements in the procedures and methods for preparing tungsten in general and in particular that which is to be used as filaments in electric incandescent lamps.