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PETER ETS
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PETER ETS
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Application filed by PETER ETSfiledCriticalPETER ETS
Application grantedgrantedCritical
Publication of FR37304EpublicationCriticalpatent/FR37304E/fr
H01J5/08—Vessels; Containers; Shields associated therewith; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
FR37304D1929-08-051929-08-05Dispositif pour accroître le rendement lumineux des sources d'éclairage électriques et autres
ExpiredFR37304E
(fr)