Document Type and Number:
Japanese Patent JPS5053072
Kind Code:
A
Application Number:
JP3874174A
Publication Date:
May 10, 1975
Filing Date:
April 05, 1974
Export Citation:
International Classes:
G04B15/02; G04B15/14; G04F5/02; (IPC1-7): G04F5/02; G04B15/00
Domestic Patent References:
| JPS4531570Y1 |