Document Type and Number:
Japanese Patent JPS5666941
Kind Code:
U
Application Number:
JP14885479U
Publication Date:
June 04, 1981
Filing Date:
October 29, 1979
Export Citation:
International Classes:
G03B23/00; G03B23/14; G10K11/00; G10K11/16; (IPC1-7): G03B23/14; G10K11/00