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发明名称
CENTRIFUGALLY CONTROLLED SIGNALLING DRIFT APPARATUS
摘要
申请公布号
US3440730(A)
申请公布日期
1969.04.29
申请号
USD3440730
申请日期
1966.09.28
申请人
BYRON JACKSON INC.
发明人
ROBERT L. ALDER
分类号
E21B21/10;E21B47/024;(IPC1-7):E21B47/02
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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