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发明名称
Packless back-seating valve
摘要
申请公布号
US2438776(A)
申请公布日期
1948.03.30
申请号
US19460643008
申请日期
1946.01.24
申请人
THE WEATHERHEAD COMPANY
发明人
BOYLAN CHARLES H.
分类号
F25B41/00
主分类号
F25B41/00
代理机构
代理人
主权项
地址
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