Document Type and Number:
Japanese Patent JPS4873645
Kind Code:
U
Application Number:
JP11966371U
Publication Date:
September 13, 1973
Filing Date:
December 17, 1971
Export Citation:
International Classes:
G03B17/20; G03B17/18; G03B31/00; (IPC1-7): G03B31/00; G03B17/18