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
Improvements in electric wave filters incorporating piezoelectric crystal elements
摘要
申请公布号
GB631772(A)
申请公布日期
1949.11.09
申请号
GB19470021775
申请日期
1947.08.07
申请人
WESTERN ELECTRIC COMPANY
发明人
分类号
H03H9/10;H03H9/54;H03H9/56;H03H9/60
主分类号
H03H9/10
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Interlocking protective door shield
Automotive suspension control system with self-adjustment feature
Exercising device
Sealing mechanism for a ball valve
Twist clip
Seat belt retractor
Apparatus for the dry defibration of sheets of fibrous cellulose material and like materials
Unitary collapsible coat hanger
Brake in a light-constructed transport carriage
Method and apparatus for casting articles
Braking system for vehicles
Molded clip reorienter and applicator
Article transport elevator
Sample splitter
Flat bed knitting machines
Frame for a vehicle sun roof
Portable shelter
Chain alignment tool
Hair coloring
Wall system construction, parts and methods of assembly