Document Type and Number:
Japanese Patent JPS5611068
Kind Code:
Y2
Application Number:
JP13083274U
Publication Date:
March 12, 1981
Filing Date:
October 29, 1974
Export Citation:
International Classes:
G03B21/11; G03B21/00; G03B21/30; G03B23/00; (IPC1-7): G03B23/00; G03B21/11