Document Type and Number:
Japanese Patent JPS5056903
Kind Code:
A
Application Number:
JP10389173A
Publication Date:
May 19, 1975
Filing Date:
September 17, 1973
Export Citation:
International Classes:
G03B31/00; G03B31/02; G11B7/00; G11B7/003; (IPC1-7): G03B31/02; G11B7/00