Document Type and Number:
Japanese Patent JPS5018507
Kind Code:
Y1
Application Number:
JP8925969U
Publication Date:
June 06, 1975
Filing Date:
September 19, 1969
Export Citation:
International Classes:
G03B31/06; G03B23/02; G11B23/44; (IPC1-7): G11B23/48; G03B23/02