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发明名称
FLUID PRESSURE CONTROL APPARATUS FOR ROTARY WELL DRILLING EQUIPMENT
摘要
申请公布号
CA514240(A)
申请公布日期
1955.06.28
申请号
CAD514240
申请日期
申请人
THE WESTINGHOUSE AIR BRAKE COMPANY
发明人
ROY R. STEVENS
分类号
主分类号
代理机构
代理人
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