Document Type and Number:
Japanese Patent JPS4818256
Kind Code:
Y1
Application Number:
JP10791969U
Publication Date:
May 25, 1973
Filing Date:
November 13, 1969
Export Citation:
International Classes:
G09B17/00; A47B47/02; A47B57/04; A47B63/00; A47B65/00; (IPC1-7): A47B63/00; A47B47/02; A47B65/00