Document Type and Number:
Japanese Patent JPS53118627
Kind Code:
U
Application Number:
JP2257677U
Publication Date:
September 20, 1978
Filing Date:
February 28, 1977
Export Citation:
International Classes:
G03B31/00; G11B5/00; G11B20/02; (IPC1-7): G03B31/00; G11B5/00