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发明名称
Ultrasonic rail test device
摘要
申请公布号
US2678559(A)
申请公布日期
1954.05.18
申请号
US19510264145
申请日期
1951.12.29
申请人
SPERRY PRODUCTS, INC.
发明人
DRAKE HARCOURT C.
分类号
G01N29/265
主分类号
G01N29/265
代理机构
代理人
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地址
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