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Publication of FR564191ApublicationCriticalpatent/FR564191A/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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FR564191D1923-03-211923-03-21Armature étanche pour éclairage, par l'électricité, des rues ou locaux humides
ExpiredFR564191A
(fr)