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
US2370403(A)
申请公布日期
1945.02.27
申请号
US19410414997
申请日期
1941.10.15
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HECHT GEORGE
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Semiconductor memory device having an electrically floating body transistor
Memory array with metal-insulator transition switching devices
Electronic device with adjustable operation modes
Foldable mobile terminal
Redundant power system transformation structure
Flexible circuit for use with a magnetic head
Display substrate, method of manufacturing the same and electrowetting display panel having the display substrate
Wavelength conversion element, wavelength conversion method, phase matching method, and light source device
E-ink display device and method for manufacturing the same
Image forming apparatus, image forming method, and information processing apparatus
Detecting a disturbance in the phase of light propagating in an optical waveguide
Electro-optic device and electronic apparatus
Liquid crystal device and method of manufacturing liquid crystal device having surface grooves and alignment film with improved thickness uniformity
Polymer enhanced cholesteric electro-optical devices
Shared memory multi video channel display apparatus and methods
Direct digital encoding and radio frequency modulation for broadcast television applications
Display control apparatus, method of controlling display apparatus, and storage medium
Mass flow controller
Device, system, and method to improve powered muscle stimulation performance in the presence of tissue edema
Cranial-electro stimulator