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发明名称
Acoustical tunnel or the like detecting device
摘要
申请公布号
US3379274(A)
申请公布日期
1968.04.23
申请号
US19660577327
申请日期
1966.09.06
申请人
NELSON A. FROST
发明人
FROST NEISON A.
分类号
G01V1/00;G01V1/147
主分类号
G01V1/00
代理机构
代理人
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地址
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