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Publication of FR611279ApublicationCriticalpatent/FR611279A/fr
F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
F21V5/00—Refractors for light sources
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FR611279D1925-03-051926-02-16Perfectionnements aux dispositifs d'éclairage
ExpiredFR611279A
(fr)