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
Signaling system
摘要
申请公布号
US2232801(A)
申请公布日期
1941.02.25
申请号
US19390304305
申请日期
1939.11.14
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
RESSLER RALPH E.
分类号
H04Q1/45
主分类号
H04Q1/45
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Blackboard eraser
Three component microscope objective of low power
Reinforcement of molded abrasive articles
Oil well drilling apparatus with high floor in mast and gin pole
Electrically-actuated oceanographic release mechanism
Flexible dummy bar for continuous casting machines
Method of producing a last for custom-made shoes
HETEROCYCLIC ANTIMICROBIAL AGENTS AND PROCESSES FOR THEIR PREPARATION
Method for etching crystals of group iii(a)-v(a) compounds and etchant used therefor
Polymerization of acrylonitrile in the presence of a phosphorus-containing vinyl aromatic polymer
Process for preparing the organometallic component of a catalytic system
PULSED RADAR SYSTEMS
TRANSISTOR AMPLIFIERS
TRANSMITTER CONTROL MECHNISM
CONTROL OF SOLIDS TRANSFERRED IN CONTINUOUS SOLID-LIQUID CONTACTING PLANT
PREPARATION OF UNSATURATED HYDROCARBONS FROM OXYGEN-CONTAINING ORGANIC MATERIALS
DUAL INTENSITY LIGHT SYSTEM HAVING DOUBLE VANE FLASHER OPERABLE AT A CONSTANT FLASHING RATE
METHANE PYROLYSIS
1-SUBSTITUTED 3-DIALKYLAMINOALKOXY-INDAZOLES AND A METHOD FOR THE PREPARATION THEREOF
AZO DYES AND THEIR PRODUCTION
