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Publication of FR774610ApublicationCriticalpatent/FR774610A/fr
F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
F21V7/00—Reflectors for light sources
F21V7/04—Optical design
F21V7/06—Optical design with parabolic curvature
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FR774610D1933-09-021933-09-02Appareil projecteur de rayons lumineux ou calorifiques ou d'ondes sonores
ExpiredFR774610A
(fr)