Document Type and Number:
Japanese Patent JPS5424331
Kind Code:
U
Application Number:
JP9817377U
Publication Date:
February 17, 1979
Filing Date:
July 21, 1977
Export Citation:
International Classes:
G03B7/00; G03B15/05; G03B19/12; (IPC1-7): G03B15/05; G03B7/00