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
Telephone exchange system
摘要
申请公布号
US1841123(A)
申请公布日期
1932.01.12
申请号
US19300438363
申请日期
1930.03.24
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HOVLAND HENRY
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Radio telephone device.
HUMAN TISSUE FACTOR RELATED DNA SEGMENTS, POLYPEPTIDES AND ANTIBODIES.
Method and apparatus for removing yarn bobbins and depositing them in a peg trolley.
HIGH POWER DENSITY EVAPORATIVELY COOLED ION EXCHANGE MEMBRANE FUEL CELL
TURBOCHARGER
Process for making milk powder, milk powder obtained thereby.
Beta-amino acid ester derivatives of alcoholic actives having extended duration of activity.
Pre-formed article consisting of a multi-ply web.
Equipment and a method for entertaining people.
SILAGE ADDITIVE
Preferential orientation of metal oxide superconducting materials.
便携式成套鼓乐
Window molding members and method of manufacturing same.
SAFETY DEVICE FOR CAR POWER WINDOWS
7-Substituted bicyclic pyrazolidinones.
Process for thermal treating of workpieces in solid state by a laser beam.
具有固定中心肘形接头的活塞和筒的旋转机械装置
遏制结构对外部干扰的反应的方法及其装置
轧机机座或机座组的运载装置
催化法制取硼酸钙
