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Publication of FR541993ApublicationCriticalpatent/FR541993A/fr
F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
F21V19/00—Fastening of light sources or lamp holders
F21V19/02—Fastening of light sources or lamp holders with provision for adjustment, e.g. for focusing
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FR541993D1921-10-051921-10-05Perfectionnement aux dispositifs de support de lampes électriques
ExpiredFR541993A
(fr)