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
Improvements in or relating to voice frequency signalling systems
摘要
申请公布号
GB691237(A)
申请公布日期
1953.05.06
申请号
GB19510017438
申请日期
1951.07.23
申请人
TELEFONAKTIEBOLAGET L M ERICSSON
发明人
分类号
H04M1/50;H04Q1/453;H04Q3/00
主分类号
H04M1/50
代理机构
代理人
主权项
地址
您可能感兴趣的专利
METHOD FOR THE PRODUCTION OF COMPOSITE SYSTEMS MADE OF METAL AND POLYMER MOULDED ITEMS
AUTOMATIC MACHINE TOOL
NANOLITHOGRAPHY MOLECULAR BEAM MACHINE
UNIDIRECTIONAL RATCHET WRENCH
BENDING ROUTE-CONTROLLED PLATE MATERIAL BENDING MACHINE
DATA COMMUNICATIONS SYSTEM USING E-MAIL TUNNELLING
FLEXIBLE VERBINDERANORDNUNG FÜR OPTISCHE FASERN
SALICYL-CALIXARENE UND IHRE VERWENDUNG ALS SCHMIERSTOFFADDITIVE
CONCENTRATOR AND ITS POWER SUPPLY RESET MANAGEMENT METHOD
EQUIPMENT AND METHOD FOR SEQUENTIAL CHROMATOGRAPHIC SIMULATED MOVING BED SEPARATION
METHOD FOR DRYING A PRODUCT USING A REGENERATIVE ADSORBENT
DDAH MODULATORS IN THE TREATMENT OF PAIN
LED CAPACITANCE DISCHARGE WITH LIMITED CURRENT
NOSE MASK
METHODS FOR THE PREVENTION AND/OR THE TREATMENT OF NEUROLOGICAL DISORDERS
SPEEDOMETER FOR TRANSPORTING APPLIANCE SUCH A SKI, ROLLER-SKI OR SNOWBOARD
FOOT MOVEMENT CONTROL TYPE GAME SYSTEM AND CONTROL METHOD THEREOF
METHOD AND EQUIPMENT FOR COMPRESSING A DISPERSION IN LIQUID-LIQUID EXTRACTION
SPRAY HEAD FOR A PRODUCT SUCH AS PAINT
IMAGING LIDAR WITH MICROMECHANICAL COMPONENTS