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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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General Engineering & Computer Science
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FR7712A1906-07-181907-05-14
Glass tiles and slabs with corrugated surface, to give light to the plumb line
ExpiredFR7712E
(en)