Document Type and Number:
Japanese Patent JPS5310197
Kind Code:
Y2
Application Number:
JP14250272U
Publication Date:
March 17, 1978
Filing Date:
December 11, 1972
Export Citation:
International Classes:
G03B21/64; G03B21/00; G03B23/00; G03B31/00; (IPC1-7): G03B21/00; G03B31/00