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
Negative resistance circuits
摘要
申请公布号
US1779126(A)
申请公布日期
1930.10.21
申请号
US19270209753
申请日期
1927.08.01
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
GRAHAM FRANK HOWARD
分类号
H04B3/16
主分类号
H04B3/16
代理机构
代理人
主权项
地址
您可能感兴趣的专利
BALL JOINT OF SUSPENSION OR STEERIGNG OF AUTOMOBILES
DUST COVER STRUCTURE OF BALL JOINT
SAFETY DEVICE OF A FORK LIFT TRUCK
BRIMMED CAP
WRIST WATCH FOR MAGNET INSERT
CHAIR LEGS FOR PIANO OF A JOIN STRUCTURE
SLIDE TYPE ERASER
FUEL GAUGE OF LPG TANK FOR A CAR
PLATE SET FOR SETTING OF DIAL GAUGE
TEMPERATURE GAUGE OF GLASS PROTECTING TYPE
LEAD FRAME LOADING DEVICE
BALL JOINT SETUP STRUCTURE OF AUTOMOTIVE CONTROL ARM
REMOTE MEASURING AND READING SYSTEM FOR LARGE CAPACITY METER
CLIP
A DRAIN SYSTEM FOR AIR DUCT OF TRACTION MOTOR IN RAILCAR
A DUMMY SOCKET FOR A PLUG INSTALLED IN RAIL CAR
LIQUID BOTTLE CAP
HIGH-WAY AND STRUCTURE OF ADVERTISING BOARD
STRUCTURE OF WHEEL CHAIR LAMP FOR A RAILCAR
SPECTACLES WITHOUT NOSE PAD
