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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
F21V5/006—Refractors for light sources applied to portable lighting devices
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FR703083D1930-10-021930-10-02Cloche de protection des lampes électriques de mines
ExpiredFR703083A
(fr)