Document Type and Number:
Japanese Patent JPS4944898
Kind Code:
B1
Application Number:
JP11938470A
Publication Date:
November 30, 1974
Filing Date:
December 28, 1970
Export Citation:
International Classes:
G03B19/18; G03B1/00; G03B31/00; G03B31/02; G03B1/58; (IPC1-7): G03B1/58