Document Type and Number:
Japanese Patent JPS5218023
Kind Code:
U
Application Number:
JP10438475U
Publication Date:
February 08, 1977
Filing Date:
July 28, 1975
Export Citation:
International Classes:
G03B21/54; G03B23/02; G11B23/08; G11B23/087; (IPC1-7): G11B23/08; G03B23/02