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
Drilling head
摘要
申请公布号
US1826059(A)
申请公布日期
1931.10.06
申请号
US19270218050
申请日期
1927.09.07
申请人
TRACY DUNN WILLIAM;ELGIN SHOWS JOHN
发明人
DUNN WILLIAM TRACY;SHOWS JOHN ELGIN
分类号
E21B10/12;E21B10/28
主分类号
E21B10/12
代理机构
代理人
主权项
地址
您可能感兴趣的专利
TIME LAG BETWEEN VIDEO AND AUDIO CORRECTION METHOD AND APPARATUS
CAMERA
SOUND REPRODUCING DEVICE
METHOD FOR FREQUENCY ANALYSIS BY TWO-STAGE PROCESSING
KARAOKE DEVICE
Semiconductor wafer washing system and method of supplying chemicals to the washing tanks of the system
Device for turning or reversing flat copies in half-revolution sheet-processing machines
Integrated circuit with identification circuit and method for checking a connection situation of a bonding pad
Human therapeutic uses of BPI Protein products
Transaction method of reusable parts
Technique for continuous user authentication
Three dimensional protective pads
Reactor and process for production thereof
Method and apparatus to optimize a computing session based on user interaction with a computer
Electrical feedback fashion brake protector device
Flatness measuring roller
Product selector
88kDa tumorigenic growth factor and antagonists
Family of mammalian potassium channels, their cloning and their use, especially for the screening of drugs
Devices and methods for addressing optical edge effects in connection with etched trenches
