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摘要
申请公布号
US2393806(A)
申请公布日期
1946.01.29
申请号
US19430511631
申请日期
1943.11.24
申请人
PILLING FRANK E
发明人
PILLING FRANK E.
分类号
B23B31/20
主分类号
B23B31/20
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