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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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FR681430D1929-03-051929-09-06Perfectionnement aux procédés et aux appareils pour la reproduction photographiqued'images
ExpiredFR681430A
(fr)
Perfectionnements apportés ou relatifs aux projecteurs cinématographiques et aux appareils reproducteurs de sons pour films combinés cinématographiques et sonores