Document Type and Number:
Japanese Patent JPS5616711
Kind Code:
Y2
Application Number:
JP17383875U
Publication Date:
April 17, 1981
Filing Date:
December 22, 1975
Export Citation:
International Classes:
G03B21/54; G03B23/02; G11B23/08; G11B23/087; (IPC1-7): G11B23/08