Document Type and Number:
Japanese Patent JPS5737478
Kind Code:
U
Application Number:
JP11336380U
Publication Date:
February 27, 1982
Filing Date:
August 12, 1980
Export Citation:
International Classes:
G04G17/02; G04B19/14; G04B37/18; G04B39/02; (IPC1-7): G04B19/14; G04B37/18