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发明名称
Rotary scratcher
摘要
申请公布号
US3111170(A)
申请公布日期
1963.11.19
申请号
US19620169909
申请日期
1962.01.30
申请人
TROJAN, INC.
发明人
SR. JESSE ELMER HALL,
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
地址
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