Document Type and Number:
Japanese Patent JPS5021553
Kind Code:
U
Application Number:
JP7335373U
Publication Date:
March 11, 1975
Filing Date:
June 20, 1973
Export Citation:
International Classes:
G03B21/00; G03B21/14; G03B31/00; G11B15/00; G11B31/00; (IPC1-7): G03B31/00; G03B21/14; G11B15/00