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G02B13/00—Optical objectives specially designed for the purposes specified below
G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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FR474816D1913-07-121914-07-07Perfectionnement à la photographie et à la cinématographie en couleurs
ExpiredFR474816A
(fr)