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 apparatus for perforating well casing
摘要
申请公布号
GB686581(A)
申请公布日期
1953.01.28
申请号
GB19510008427
申请日期
1949.01.18
申请人
GULF RESEARCH & DEVELOPMENT COMPANY
发明人
分类号
E21B29/02;E21B43/117;F42B3/08
主分类号
E21B29/02
代理机构
代理人
主权项
地址
您可能感兴趣的专利
Means to produce a hydrocarbon and metallic sol
Preparation of cellulose nitroacetate higher fatty acid ester
Harvester
Electric current rectifying system
Hose coupling
Toilet seat
Venetian blind channel guide fixture
Changing sign
Brake mechanism
Apparatus for use in the manufacture of laminated glass
Leveler
Modulation circuit arrangement
Soffit reenforcement
Multi-ply bag and method of producing same
Improvements in electric couplings of the plug and socket type
Improvements in or relating to railway track members
A new hinge for real and imitation tortoiseshell spectacle frames and the like
Improvements in or relating to gasholders
Improvements in or relating to automatic weighing and/or grading machines
Improvements in or relating to electrical signalling systems