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发明名称
ULTRASONIC RAIL FLAW DETECTOR SEARCH UNIT
摘要
申请公布号
CA508021(A)
申请公布日期
1954.12.07
申请号
CAD508021
申请日期
申请人
SPERRY PRODUCTS INC.
发明人
HARCOURT C. DRAKE
分类号
主分类号
代理机构
代理人
主权项
地址
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