Document Type and Number:
Japanese Patent JPS5621313
Kind Code:
B2
Application Number:
JP4359874A
Publication Date:
May 19, 1981
Filing Date:
April 17, 1974
Export Citation:
International Classes:
H04M11/06; G06F3/14; G06F3/153; H04L21/00; H04M11/00; H04N7/10