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发明名称
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摘要
申请公布号
US2146341(A)
申请公布日期
1939.02.07
申请号
US19340731235
申请日期
1934.06.19
申请人
MYRTIL KAHN
发明人
KAHN MYRTIL
分类号
E01B9/68
主分类号
E01B9/68
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