Document Type and Number:
Japanese Patent JPS5055330
Kind Code:
A
Application Number:
JP6863474A
Publication Date:
May 15, 1975
Filing Date:
June 14, 1974
Export Citation:
International Classes:
G03B19/18; G03B31/00; G03B31/02; (IPC1-7): G03B31/02; G03B23/02