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
Drill
摘要
申请公布号
US2614811(A)
申请公布日期
1952.10.21
申请号
US19490070072
申请日期
1949.01.10
申请人
H. E. FLETCHER COMPANY
发明人
MELENDY NORMAN G.
分类号
E21B10/58
主分类号
E21B10/58
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Apparatus for creating a water formed image
Multiwavelength barcode reader
RFID devices using metamaterial antennas
Method and device for recognizing optical splitter and optical splitter ports
Valve and dispenser
Method and apparatus for tracking conveyor belts
Roller clutch assembly
Clutch assembly and force transmission device with a clutch assembly
Electrical connection device for electric vehicles
Elevator with traction sheave
System and method to prevent premature wear on key shaft
Lubricating nipple
Agricultural device
Low equivalent circulation density setting tool
Dual pathway riser and its use for production of petroleum products in multi-phase fluid pipelines
Emergency disconnect sequence timer display and method
Wire untwisting tool
Corrugated metal pipe
In-tank tube for automotive fuel and method of producing the tube
Flow rate control valve and spool position detection device for the flow rate control valve
