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发明名称
Position indicator for pipe scraper
摘要
申请公布号
US2782407(A)
申请公布日期
1957.02.19
申请号
US19530399777
申请日期
1953.12.22
申请人
T. D. WILLIAMSON, INC.
发明人
NOOY BURTON VEWR
分类号
F16L55/48
主分类号
F16L55/48
代理机构
代理人
主权项
地址
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