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发明名称
Weight unit indicating apparatus
摘要
申请公布号
US2266361(A)
申请公布日期
1941.12.16
申请号
US19400334281
申请日期
1940.05.09
申请人
EDWARDS WILLIAM K
发明人
EDWARDS WILLIAM K.
分类号
E21B47/00;G01G19/14
主分类号
E21B47/00
代理机构
代理人
主权项
地址
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