专利名称：OBJECTIVES OF VARIABLE FOCAL LENGTH发明人：GORDON HENRY COOK,FRANCOIS RENE
LAURENT
申请号：US3682534D申请日：19710108公开号：US3682534A公开日：19720808
摘要：A zoom lens front member which is divergent and is divided into two divergentparts, of which the rear part only is movable for focusing purposes, in accordance withthe following relationships:
申请人：RANK ORGANISATION LTD.:THE
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