Document Type and Number:
Japanese Patent JPS5220303
Kind Code:
Y2
Application Number:
JP11255572U
Publication Date:
May 10, 1977
Filing Date:
September 28, 1972
Export Citation:
International Classes:
G03B31/04; G03B31/00; G09F9/00; G09G3/00; G11B31/00; (IPC1-7): G03B31/04; G11B31/00