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发明名称
PENDULUM RELEASE SYSTEM FOR SIGNALLING DRIFT INDICATOR
摘要
申请公布号
US3457654(A)
申请公布日期
1969.07.29
申请号
USD3457654
申请日期
1966.07.01
申请人
BYRON JACKSON INC.
发明人
ROBERT LEE ALDER
分类号
E21B7/04;E21B47/024;(IPC1-7):E21B47/02;G01C9/14
主分类号
E21B7/04
代理机构
代理人
主权项
地址
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