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发明名称
Letter balance
摘要
申请公布号
US2157807(A)
申请公布日期
1939.05.09
申请号
US19380215045
申请日期
1938.06.21
申请人
RUDOLF WESTERMANN
发明人
WESTERMANN RUDOLF
分类号
G01G19/00
主分类号
G01G19/00
代理机构
代理人
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