Document Type and Number:
Japanese Patent JPS4992817
Kind Code:
U
Application Number:
JP13800772U
Publication Date:
August 12, 1974
Filing Date:
November 30, 1972
Export Citation:
International Classes:
G03B31/00; G11B5/03; G11B31/00; (IPC1-7): G03B31/00; G11B5/033; G11B31/00