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G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
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Optics & Photonics
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FR657138D1927-09-071928-07-07Perfectionnements aux objectifs pour la photographie
ExpiredFR657138A
(fr)