Antonelli, Terry, Stout & Kraus
Method and apparatus of measuring a subscriber line
 A subscriber line measuring method and apparatus can charge a line capacitance of a telephone subscriber line in a very short time as compared with a prior art by charging the line capacitance by a predetermined current without use of a high resistor (100 k.OMEGA.) in a conventional measuring apparatus, and thereby can measure an impedance of the telephone subscriber line in a very short time with high accuracy. 
Hitachi, Ltd.
H
H04M
inventional
Hirohumi Makoto
Masukawa Hisamura