Document Type and Number:
Japanese Patent JPS4946261
Kind Code:
B1
Application Number:
JP1028667A
Publication Date:
December 09, 1974
Filing Date:
February 18, 1967
Export Citation:
International Classes:
G03B31/06; G03B21/00; G03B31/02; G03B41/02; G11B31/00; (IPC1-7): G03B21/00; G03B31/02; G11B31/00