Document Type and Number:
Japanese Patent JPS5435646
Kind Code:
U
Application Number:
JP10940677U
Publication Date:
March 08, 1979
Filing Date:
August 16, 1977
Export Citation:
International Classes:
G03B21/00; G03B17/18; G03B17/40; G03B19/18; (IPC1-7): G03B21/00