Document Type and Number:
Japanese Patent JPS5774942
Kind Code:
U
Application Number:
JP15196180U
Publication Date:
May 08, 1982
Filing Date:
October 23, 1980
Export Citation:
International Classes:
C04B33/36; C04B33/00; G09B19/10; (IPC1-7): C04B33/00; G09B19/10