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发明名称
Balance
摘要
申请公布号
US2228872(A)
申请公布日期
1941.01.14
申请号
US19380227507
申请日期
1938.08.30
申请人
DURFEE WALTER C
发明人
DURFEE WALTER C.
分类号
G01G1/00
主分类号
G01G1/00
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代理人
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