Document Type and Number:
Japanese Patent JPS5645834
Kind Code:
U
Application Number:
JP12600979U
Publication Date:
April 24, 1981
Filing Date:
September 12, 1979
Export Citation:
International Classes:
G09B29/02; G03B21/00; G03B23/00; G09B29/00; (IPC1-7): G03B21/00; G03B23/00; G09B29/00