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
US2298519(A)
申请公布日期
1942.10.13
申请号
US19400341634
申请日期
1940.06.21
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
TILLMAN RICHARD J.
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
VALVE ACTUATOR
MOTOR OPERATED VALVE
SUSPENSION HOOK
ROLLER BEARING
ROTARY ACTUATOR
SLIDING TYPE CONSTANT VELOCITY UNIVERSAL JOINT
MOTOR INTEGRATED MAGNETIC BEARING DEVICE
MOTOR INTEGRATED MAGNETIC BEARING DEVICE
BUTTERFLY VALVE AND PRESSURE MEASURING DEVICE FOR FIRE EXTINGUISHING EQUIPMENT
DAMPING FORCE GENERATING VALVE STRUCTURE FOR HYDRAULIC SHOCK ABSORBER
MOTOR DRIVEN COMPRESSOR
EXHAUST DEVICE FOR VEHICLE AND MOTORCYCLE HAVING EXHAUST DEVICE
IGNITION TIMING CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE
ELECTRIC PUMP
VARIABLE VALVE GEAR FOR INTERNAL COMBUSTION ENGINE
PUMP DEVICE AND POWER STEERING DEVICE
CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE
INTERNAL COMBUSTION ENGINE WITH TURBOCHARGER
WOBBLE DETECTOR
PICKUP DEVICE AND DISK DEVICE
