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
US2248566(A)
申请公布日期
1941.07.08
申请号
US19390268651
申请日期
1939.04.19
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BUSCH ALOYSIUS J.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
您可能感兴趣的专利
METHOD FOR PREPARING PURPLE MEMBRANE-CONTAINING MEMBRANE
SEMICONDUCTOR DEVICE
LEAD CUT MOLDER
TIMER CONTROL METHOD
SILVER HALIDE PHOTOGRAPHIC SENSITIVE MATERIAL
INSPECTING INSTRUMENT
MAGNETIC FILTER EQUIPMENT
PREPARATION OF PHOTOSENSITIVE MATERIAL FOR SILVER COMPLEX DIFFUSION TRANSFER PROCESS
RECORDER
MASSAGE COSMETIC
NOVEL PHYSIOLOGICALLY ACTIVE PEPTIDE
INSERT MOLDING METHOD
13 BETA-CARBAMOYLOXYMILBEMYCIN DERIVATIVE, MANUFACTURE AND VERMICIDAL COMPOSITION
MEDICINE CONTAINING QUINOLINE-2,8-DICARBOXYLIC ACID DERIVATIVE
FOCUS ADJUSTING DEVICE
DC-DC CONVERTER
STACK
LIQUID PRESSURE CONTROLLER
ROTOR OF SUPERCONDUCTIVE ROTARY ELECTRIC MACHINE
OPTICAL CHARACTER READER
