Document Type and Number:
Japanese Patent JPS54176336
Kind Code:
U
Application Number:
JP7436578U
Publication Date:
December 13, 1979
Filing Date:
June 02, 1978
Export Citation:
International Classes:
G03B21/00; G03B23/00; G03B31/04; G11B31/00; (IPC1-7): G03B21/00; G03B23/00; G03B31/04; G11B31/00