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发明名称
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摘要
申请公布号
US2527961(A)
申请公布日期
1950.10.31
申请号
US19480041449
申请日期
1948.07.30
申请人
RANTZ ELMER J
发明人
RANTZ ELMER J.
分类号
G01C9/28
主分类号
G01C9/28
代理机构
代理人
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