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1.发明授权Optical system for reducing the viewing angle of certain devices such as photoelectric cells 失效用于减小诸如光电池的某些装置的视角的光学系统
公开(公告)号：US2248758A
公开(公告)日：1941-07-08
申请号：US16922437
申请日：1937-10-15
Applicant: INT STANDARD ELECTRIC CORP
Inventor： EUGENE HIGONNET RENE ALPHONSE , MAURICE LUCAS ROBERT
CPC classification number: G01J1/04 , G01J1/0477 , G01J1/06
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