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Application filed by Zeiss Ikon AgfiledCriticalZeiss Ikon Ag
Publication of CH208778ApublicationCriticalpatent/CH208778A/de
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