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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
Landscapes
Engineering & Computer Science
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FR7712A1906-07-181907-05-14Carreaux et dalles en verre à surface ondulée, pour donner du jour à plomb
ExpiredFR7712E
(fr)