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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 -
G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
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FR1066698D1952-11-191952-11-19Objectif à correction sphérique, chromatique et astigmatique
ExpiredFR1066698A
(fr)