首页
产品
黄页
商标
征信
会员服务
注册
登录
全部
|
企业名
|
法人/股东/高管
|
品牌/产品
|
地址
|
经营范围
发明名称
TEST METHOD FOR SUBSCRIBING LINES
摘要
<p>PURPOSE:To enable the short and ground faults of the subscribing lines for the detection from the four wires side of the subscribing lines, in the time-sharing local telephone exchangers of four lines type.</p>
申请公布号
JPS534412(A)
申请公布日期
1978.01.17
申请号
JP19760077785
申请日期
1976.07.02
申请人
HITACHI LTD
发明人
KAMATA KOUZOU
分类号
G01R31/08;H04B3/46;H04M3/30
主分类号
G01R31/08
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Process variable of interest monitoring and control
Vision-based operating method and system
Printer and print system, and data receiving device and data transmitting and receiving system
Ionization source for mass spectrometry analysis
Toy vehicle having rotatable light display
Aluminum conductor composite core reinforced cable and method of manufacture
Porcine CMP-N-Acetylneuraminic acid hydroxylase gene
Container for shipping and storing paper
Methods and apparatus for rapid acoustic unit selection from a large speech corpus
Optical control device
Process and device for the production of elastomer-modified thermoplastics
Eight-cylinder engine
Method for producing a spin valve transistor with stabilization
Movable girder mounted jib
Bidirectional micropositioning recording head for a magnetic storage device
Methods and apparatus for sharing cell coverage information
Magnetic head and magnetic head substructure including resistor element whose resistance corresponds to the length of the track width defining portion of the pole layer
Apparatus and method for preventing free flow in an infusion line
Light source for a display device
Electroplating apparatus including a real-time feedback system