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 trunking system
摘要
申请公布号
US2302587(A)
申请公布日期
1942.11.17
申请号
US19410404101
申请日期
1941.07.26
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ULRICH HORACE W.
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
Karpiinihaka
GRANULAR AROMATIC POLYIMIDE RESIN COMPOSITION
POLYBUTYLENE TEREPHTHALATE RESIN COMPOSITION
WEATHER-AND IMPACT-RESISTANT POLYMER COMPOSITION OF EXCELLENT APPEARANCE
OPTICAL RESIN
POLYVINYL ACETAL RESIN AND INTERMEDIATE FILM FOR LAMINATED GLASS
PRODUCTION OF COMPOUND SEMICONDUCTOR SINGLE CRYSTAL
FERRITE MATERIAL
AXLE SHAFT OF REAR WHEEL FOR MOTORCYCLE
SPEAKER DEVICE FOR CANCELING EXHAUST NOISE
OUTPUT METHOD AND ITS DEVICE
COMPUTERIZED TYPESETTING PRINTER
PLATE VICE DEVICE FOR PRINTER
FLAME-RETARDED RESIN LAMINATE SHEET
CORE DRILL
FULLY AUTOMATIC WASHING MACHINE WITH FEED WATER/FEED HOT WATER DEVICE
ILLUSTRATION SLIDE
FLIGHT CONTROLLER
AUTOMATIC FIRE EXTINGUISHING ROOM FOR FIRE AND ITS REFUGE BOX
UPRIGHT TYPE VACUUM CLEANER