Document Type and Number:
Japanese Patent JPS5247521
Kind Code:
Y2
Application Number:
JP9195973U
Publication Date:
October 28, 1977
Filing Date:
August 06, 1973
Export Citation:
International Classes:
G03B27/32; G03F1/00; G03F7/20; G03F7/24; G03F9/00; (IPC1-7): G03F7/20; G03B27/32; G03F1/00