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 system
摘要
申请公布号
US2209777(A)
申请公布日期
1940.07.30
申请号
US19380243348
申请日期
1938.12.01
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
KING RALPH E.;MILLER OHMER R.
分类号
H04M3/40;H04M3/60;H04Q3/00;H04Q3/42
主分类号
H04M3/40
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Perforating gun release apparatus
Electrophotographic photoreceptor
Method and apparatus for flexible and optimal telephone call acceptance and routing
Motor cycle with front wheel brake arrangement
HIERARCHICAL ENCODING METHOD AND APPARATUS FOR EFFICIENTLY COMMUNICATING IMAGE SEQUENCES
Apparatus exploiting the Peltier effect to detect the risk of condensation on a surface which borders a volume of humid air
INERTIA SWITCH
Perforator
METHOD OF THE WATER PURIFICATION AND DEVICE FOR CARRYING OUT THE METHOD
AQUEOUS SUSPENSION OF SILICON DIOXIDE AND ALUMINIUM SULPHATE OR ALUM AND PREPARATION METHOD AND USE OF THIS SUSPENSION
PRESSURE SENSITIVE ADHESIVE COMPOSITION AND PRODUCTS
MOLDABLE PANEL AND METHOD OF MAKING SAME
BASKET CARRIER FOR BOTTLES AND BLANK THEREFOR
AUTOMATIC CROSSING PROTECTION NOT REQUIRING MEANS FOR TRAIN PRESENCE DETECTION
SEMICONDUCTOR DEVICE WITH A CARRIER BODY ON WHICH A SUBSTRATE WITH A SEMICONDUCTOR ELEMENT IS FASTENED BY MEANS OF A GLUE LAYER AND ON WHICH A PATTERN OF CONDUCTOR TRACKS IS FASTENED
METHOD RELATING TO THE MANUFACTURING OF A COMPOSITE METAL PRODUCT
Expression of porcine reproductive respiratory syndrome virus polypeptides in the same cell
Bearing support disposed on the ends of shafts
High fidelity color rendering method avoiding moire problems
Safety system for the forward and reverse control of an automatic transmission
