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 telephone and like signalling systems
摘要
申请公布号
GB412611(A)
申请公布日期
1934.07.02
申请号
GB19320036992
申请日期
1932.12.31
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
H04B3/44
主分类号
H04B3/44
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Communication system and method
Fluid testing device
Business matchmaking system
Multi quick connector for subsea use
A rotator cap assembly for a post driver
Graphene super capacitor
Bicycle puncture finder
Versatile bicycle trailer
Audio system and method
Suspended pot frame
Doherty amplifier for amplifying an input amplitude modulated signal
A filling loop for use in adding mains water to a central heating system
Biomarker assay
Chair having a reminder function
Removable blind fastener for joining components
Railway section delimiting using portable terminal
Reinforcing means, frame structure and motor vehicle
Live AD processing engine service
Inflatable helmet
System and method for multiport automation
