Document Type and Number:
Japanese Patent JPS53161765
Kind Code:
U
Application Number:
JP6823877U
Publication Date:
December 18, 1978
Filing Date:
May 26, 1977
Export Citation:
International Classes:
G09B9/00; G09B19/00; G09B19/16; (IPC1-7): G09B9/00; G09B19/00