Improved oil well mast crown block,申请号GB19550004553-传众专利搜索

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发明名称	Improved oil well mast crown block
摘要
申请公布号	GB764661(A)	申请公布日期	1956.12.28
申请号	GB19550004553	申请日期	1955.02.15
申请人	LEE C. MOORE CORPORATION	发明人
分类号	B66D3/06;E21B19/02	主分类号	B66D3/06
代理机构		代理人
主权项
地址

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