Document Type and Number:
Japanese Patent JPS482827
Kind Code:
U
Application Number:
JP4161271U
Publication Date:
January 13, 1973
Filing Date:
May 21, 1971
Export Citation:
International Classes:
G09B5/06; G02B27/02; G03B31/00; G03B31/06; (IPC1-7): G03B31/00; G02B27/02; G09B5/06