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发明名称
Pipe line plugger
摘要
申请公布号
US2812778(A)
申请公布日期
1957.11.12
申请号
US19550539487
申请日期
1955.10.10
申请人
T. D. WILLIAMSON, INC.
发明人
NOOY BURTON VER
分类号
F16L55/105
主分类号
F16L55/105
代理机构
代理人
主权项
地址
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